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double unit string oscillograph, type 338-DO

double unit string oscillograph, type 338-DO

General Radio Company
1928-1932
electron oscillograph and Bedell sweep circuit

electron oscillograph and Bedell sweep circuit

General Radio Company
c. 1935
oscillograph type 579-A

oscillograph type 579-A

General Radio Company
circa 1930
power supply for cathode ray oscillograph, type 496-B

power supply for cathode ray oscillograph, type 496-B

General Radio Company
c. 1931
string oscillograph

string oscillograph

General Radio Company
ca. 1928-1932
sweep circuit for cathode ray oscillograph, type 506-A

sweep circuit for cathode ray oscillograph, type 506-A

General Radio Company
c. 1931
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