- Manual for Tektronix type 661, 4S2A and 5T3 (original)
- Schematics or manual for Van Der Heem EC9920
- Manual for Philips GM2314
- Old catalogs of mentioned companies
- Electrolytic 4700uF @ 15V FP twist-mount
- Options -14, -24, -10 for Dana 6900 voltmeter
- Adapter AC-probe to N for hp 410B/C voltmeter
- Option -51 or -94 for Dana / Racal-Dana 5000 voltmeter
- Ballantine model 2421 Error Computer
- Weigh-Tronix Model 400 Agricultural Scale
