1

Moving-coil ohmmeter

Year:
1939
Language:
english
File:
PDF, 120 KB
english, 1939
2

High tension electric resistance thermometer

Year:
1939
Language:
english
File:
PDF, 226 KB
english, 1939
3

Cold-cathode, high-cathode potential oscillograph

Year:
1938
Language:
english
File:
PDF, 330 KB
english, 1938