Bell and Howell oscillograph type 5-137 P9-12
Bell and Howell oscillograph type 5-137 P9-12, by Bell and Howell Ltd., Electronic Instruments Division, Basingstoke, England, no movements installed.
Bell and Howell oscillograph type 5-137 P9-12, by Bell and Howell Ltd., Electronic Instruments Division, Basingstoke, England, with remote control unit and accessories
Bell and Howell oscillograph type 5-137 P9-12, by Bell and Howell Ltd., Electronic Instruments Division, Basingstoke, England, no movements installed.
Remote control unit for Bell and Howell oscillograph 5-137
Accessories for oscillograph in wooden box, comprising 2 mercury lamps, 2 relays, plugs and oscillograph movements