AMPLIFIERS
Filtek 

CAPACITORS
Arizona Capacitor
Bycap Inc.
Component Research Co.
Custom Electronics Inc.
Goguen Ind.
High Energy Corp.
SEMCO
Spectrum Control, Inc.

CIRCUIT BOARDS &
ELECTRONIC COMPONENTS
Frequency Selective Networks, Inc.

COILS
Communication Coil
Frequency Selective Networks, Inc. Vanguard Electronics Co., Inc.

CONNECTORS
Spectrum Control, Inc.

DISCRIMINATORS
Filtek

FILTERS
Bycap Inc.
Filtek
Frequency Selective Networks, Inc.
Spectrum Control, Inc.  

GASKETING
MAJR Products Corp.

MACHINED PRODUCTS
LaFayette General Machine Works
Mar-May Precision
Wright Engineering

OSCILLATORS
Filtek

RESISTOR ASSEMBLIES
Frequency Selective Networks, Inc.

RESISTORS
Precision Resistor 

ROTARY SWITCHES
CRL Components
Electro Switch

TRANSFORMERS
Communication Coil
Frequency Selective Networks, Inc.