SERVO POTENTIOMETERS

INSTRUMENTS WHOSE PURPOSES ARE TO INDICATE, RECORD OR CONTROL THE VALUE OF ONE OR MORE VARIABLES OF AN INDUSTRIAL PROCESS

a Keyboard and Code Box Used to Actuate Automatic Garage Door Openers

SET OF PRINTED CIRCUIT BOARDS, ASSOCIATED COMPONENTS, TOOLS, A PARTS LIST AND INSTRUTIONS EMBEDDED IN A BOOK FOR ASSEMBLY OF VARIOUS PROJEC TS