FOR ELECTRONIC MATERIAL, APPARATUS AND INSTRUMENTS, ESPECIALLY FOR USE IN THE NUCLEAR FIELD, NAMELY: ADAPTERS; BRANCH DRIVERS; BRANCH HIGHWA Y TERMINATORS; BUS TERMINATORS; CABLES; CHARACTER AND VECTOR GENERATORS; COMMUNICATION INTEFACES WITH BUFFERS; COMPUTERS AND MICROCOMPUTERS; CONSOLES; CRATE CONTROLLERS AND AUXILIARY CRATE CONTROLLERS FOR COMPUTERS; D.C. MOTOR AMPLIFIERS; DELAY UNITS; DIGITAL VOLTMETERS; DISCRIMINATORS; EPROM PROGRAMMERS; GRADERS; INPUT AND OUTPUT REGISTERS; INTERFACE AND MEMORY CARDS; LIGHT PENS; LINES SURVEYORS; LOGIC UNITS; MEMORY CHIPS; MODULE EXTENDERS; MOTOR; MULTILOGIC UNITS; MULTIPLEXERS; PATTERN UNITS; POWER SUPPLIES; POWERED CRATES; POSITION ENCODERS; PROCESSORS; PROGRAMMABLE ATTENUATORS; PROGRAMMABLE DELAYS; QUAD DELAY BOX CONTROL MODULES; RELAYS; SCALES; SERIAL; SCOPE DISPLAY RECORDER; STEPPER MOTOR DRIVERS; TEST MODULE; TIME CLOCKS AND TIME RECORDERS; TIMING UNITS; TRANSMISSION SYSTEM MAST ER UNITS; VIDEO DISPLAY; WIDE BAND ROUTERS