DDD CORPORATIONS

Electrical Contractors and Other Wiring Installation Contractors

Establishments in this category are primarly engaged in installing and servicing electrical wiring and equipment. Contractors included in this industry may include both the parts and labor when performing work. These contractors may perform new work, additions, alterations, maintenance, and repairs.

Illustrative Examples:

Airport runway lighting contractors
Fiber optic cable (except transmission line) contractors
Alarm system (e.g., fire, burglar), electric, installation only
Highway, street, and bridge lighting and electrical signal installation
Audio equipment (except automotive) installation contractors
Home automation system installation
Lighting system installation
Cable television hookup contractors
Telecommunications equipment and wiring (except transmission line) installation contractors
Computer and network cable installation
Traffic signal installation
Environmental control system installation
Cable splicing, electrical or fiber optic

Petroleum Refineries

Establishments in this category are primarly engaged in refining crude petroleum into refined petroleum. Petroleum refining involves one or more of the following activities: (1) fractionation; (2) straight distillation of crude oil; and (3) cracking.

Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing

This includes establishments primarily engaged in (1) manufacturing stationary air purification equipment, such as industrial dust and fume collection equipment, electrostatic precipitation equipment, warm air furnace filters, air washers, and other dust collection equipment, and/or (2) manufacturing attic fans and industrial and commercial fans and blowers, such as commercial exhaust fans and commercial ventilating fans.

Heating Equipment (except Warm Air Furnaces) Manufacturing

This includes establishments primarily engaged in manufacturing heating equipment (except electric and warm air furnaces), such as heating boilers, heating stoves, floor and wall furnaces, and wall and baseboard heating units.

Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing

This includes establishments primarily engaged in (1) manufacturing air-conditioning (except motor vehicle) and warm air furnace equipment and/or (2) manufacturing commercial and industrial refrigeration and freezer equipment.

Illustrative Examples:

Air-conditioning and warm air heating combination units manufacturing
Air-conditioning compressors (except motor vehicle) manufacturing
Air-conditioning condensers and condensing units manufacturing
Dehumidifiers (except portable electric) manufacturing
Heat pumps manufacturing
Humidifying equipment (except portable) manufacturing
Refrigerated counter and display cases manufacturing
Refrigerated drinking fountains manufacturing
Snow making machinery manufacturing
Soda fountain cooling and dispensing equipment manufacturing

Electronic Computer Manufacturing

This includes establishments primarily engaged in manufacturing and/or assembling electronic computers, such as mainframes, personal computers, workstations, laptops, and computer servers. Computers can be analog, digital, or hybrid. Digital computers, the most common type, are devices that do all of the following: (1) store the processing program or programs and the data immediately necessary for the execution of the program; (2) can be freely programmed in accordance with the requirements of the user; (3) perform arithmetical computations specified by the user; and (4) execute, without human intervention, a processing program that requires the computer to modify its execution by logical decision during the processing run. Analog computers are capable of simulating mathematical models and contain at least analog, control, and programming elements. The manufacture of computers includes the assembly or integration of processors, coprocessors, memory, storage, and input/output devices into a user-programmable final product.

Computer Storage Device Manufacturing

This includes establishments primarily engaged in manufacturing computer storage devices that allow the storage and retrieval of data from a phase change, magnetic, optical, or magnetic/optical media. Examples of products made by these establishments are computer disk drives, USB flash drives, and tape storage and backup units.

Computer Terminal and Other Computer Peripheral Equipment Manufacturing

This includes establishments primarily engaged in manufacturing computer terminals and other computer peripheral equipment (except storage devices).

Illustrative Examples:

Automated teller machines (ATM) manufacturing
Computer terminals manufacturing
Joystick devices manufacturing
Keyboards, computer peripheral equipment, manufacturing
Monitors, computer peripheral equipment, manufacturing
Mouse devices, computer peripheral equipment, manufacturing
Optical readers and scanners manufacturing
Plotters, computer, manufacturing
Point-of-sale terminals manufacturing
Printers, computer, manufacturing

Telephone Apparatus Manufacturing

Establishments in this category are primarly engaged in manufacturing wire telephone and data communications equipment. These products may be stand-alone or board-level components of a larger system. Examples of products made by these establishments are central office switching equipment, cordless and wire telephones (except cellular), PBX equipment, telephone answering machines, LAN modems, multi-user modems, and other data communications equipment, such as bridges, routers, and gateways.

Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing

Establishments in this category are primarly engaged in manufacturing radio and television broadcast and wireless communications equipment. Examples of products made by these establishments are transmitting and receiving antennas, cable television equipment, GPS equipment, pagers, cellular phones, mobile communications equipment, and radio and television studio and broadcasting equipment.

Other Communication and Energy Wire Manufacturing

This includes establishments primarily engaged in manufacturing insulated wire and cable of nonferrous metals from purchased wire.

Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers

Establishments in this category are primarly engaged in the merchant wholesale distribution of electrical construction materials; wiring supplies; electric light fixtures; light bulbs; and/or electrical power equipment for the generation, transmission, distribution, or control of electric energy.

Hardware Merchant Wholesalers

Establishments in this category are primarly engaged in the merchant wholesale distribution of hardware, knives, or handtools.

Illustrative Examples:

Brads merchant wholesalers
Cutlery merchant wholesalers
Knives (except disposable plastics) merchant wholesalers
Power handtools (e.g., drills, saws, sanders) merchant wholesalers
Fasteners (e.g., bolts, nuts, rivets, screws) merchant wholesalers
Staples merchant wholesalers
Handtools (except motor vehicle, machinists' precision) merchant wholesalers
Hardware (except motor vehicle) merchant wholesalers
Tacks merchant wholesalers
Keys and locks merchant wholesalers

Sporting and Recreational Goods and Supplies Merchant Wholesalers

Establishments in this category are primarly engaged in the merchant wholesale distribution of sporting goods and accessories; billiard and pool supplies; sporting firearms and ammunition; and/or marine pleasure craft, equipment, and supplies.

Toy and Hobby Goods and Supplies Merchant Wholesalers

Establishments in this category are primarly engaged in the merchant wholesale distribution of games, toys, fireworks, playing cards, hobby goods and supplies, and/or related goods.