- Daci design analysis software, consulting
- Dale resistors, pots, thermistor, inductors, crystals, connectors
- Danaher Controls electronic controls, timers, counters, encoders
- Dane Memory low profile DIMM
- Daniel Woodhead Company electrical wiring components and wiring systems
- Darnell power conversion technology for telecom
- DataCommPro recruiters
- Dataforth signal conditioning and data communications
- Data General servers, storage products and services for information systems
- Datalight ROM DOS
- Daybreak Communications information on electronic component distributors
- DayStar Digital Mac OS workstation
- DB Products microwave switches, magnetics and power-semi based products
- Degem Systems educational products
- Degree C controllers for thermal management in enclosures
- Delta Tau Data Systems motion control hardware and software
- Design Specialty lighted signs and displays
- Detection Technology pin photodiodes and detectors
- Dialight
- Dialogic PCS wireless networks
- Diamond Vision ???? IE viewable ONLY!
- DIB Electronic Design
- Die-Tech lead frames and lead assembly equipment
- DigiBoard data communications hardware and software
- Digital Island single-hop global Internet connectivity
- DLI1
- Digital Microwave integrated wireless connection solutions for telecommunications networks
- Digital Wireless telecom modules
- Direct Silicon Design custom ICs, circuit boards, multi-chip modules, or hybrid boards
- Diversified Engineering vision guage system
- DMT rf coax switches, switch matrices, filters and integrated assemblies
- Dolch test equipment, ruggedized computers
- Douglas Mac-based electronics design and manufacturing system
- Dove theatrical lighting control equipment
- Dow-Key microwave switches & RF coaxial relays
- Doxa Audio Development high quality pre/power audio amplifiers
- DPS telemetry monitoring
- Dresser Industries pressure and temperature instruments, sensors and transducers
- Dressler RF Technologies RF power electronic products
- DSP Tools DSP hardware and software
- Duel Systems PCMCIA packaging
- DVT machine vision equipment
- Dynaload DC electronic loads
- Dynamic Hybrids design, prototyping, manufacturing and testing of hybrid circuits
- Dynamics Research systems, test equipment, federal services, encoders, photolithographics
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