BIDDLE Instruments "A Stitch In Time" Manual On Electrical Insulation Testing

Associated Research Operators Manual Hipot/Ground Test Set 4040AT 4050AT 5060AX

Associated Research High Potential Dielectric Withstand Testing with 04450DT

Tektronix oscilloscopes & associated instruments catalog (1970)

Megger Ground Testing Instrument Catalog and Practice Manual 1930's

Associated Research 4040AT,AX/4050AT,AX/5060AT,AX Test Set Manual 36604 Rev C

Associated Research High Potential Dielectric Withstand Testing 04450DT AC/DC

Hypot High Potential Insulation Breakdown Testing Associated Research Inc.