LIE DETECTOR / POLYGRAPH Vintage 1953 How-To build PLANS

*Quiz Party Guest w/ Double-Action Lie Detector" 1936 Vintage HowTo Build PLANS

Wireless Audio Transmitter 1954 How-To build PLANS Tube Power

Applause Meter Tube Powered 1953 How-To Build PLANS

COIL WINDING MACHINE How-To build PLANS Counts turns ELECTRIC

Capacity Switch - Tube powered Motion Control 1950 How-To build PLANS

Photoelectric Pistol & Target 1948 HowTo build PLANS Tube Powered

New The Calling Card (VINTAGE 1986) The Electronic Little Black Book