- Allen Avionics, Inc.
 - Mineola - Manufacturer of precision LC filters and electro-magnetic delay lines for the electronics industry. - Custom Remote Systems
- Westbury - Offers custom and standard infrared remote controls, specialising in infrared learning remote controls.
- Data Device Corporation
- Bohemia - Manufacturer of Mil-Std-1553 data bus and Arinc 429/629 products, synchro/resolver converters, motor drives and controllers, and solid-state power controllers.
- HD Systems, Inc
- Hauppauge - Manufacturer of gearheads, DC servo motors, integral encoders and motion control systems.
- International Components Corp.
- Melville - Complete range of tube types.
- JACO Electronics
- Hauppauge - Distributes electronic components and electro-mechanical devices to manufacturers. Products include semiconductors, capacitors, resistors, electro-mechanical devices and computers.
- MCG Surge Protection
- Deer Park - AC power line and data line protection for sensitive equipment; guards against damage from transients, lightning and surges.
- Prismark Partners
- Cold Spring Harbor - Consulting company that advises the electronics industry.
- Richard Manno & Co., Inc.
- West Babylon - Complete range of electronic hardware components for breadboard, prototype and production applications.
- SAI Semispecialists of America, Inc.
- Farmingdale - Distributor of electronic components specialising in allocated and obsolete products.
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