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- General Electric Type P.M. Oscillograph -
- Collections - Artifact
General Electric Type P.M. Oscillograph
- RCA Oscillograph, Model AQ-1687, circa 1915 -
- circa 1915
- Collections - Artifact
RCA Oscillograph, Model AQ-1687, circa 1915
- Cambridge Instrument Company Oscillograph -
- circa 1925
- Collections - Artifact
Cambridge Instrument Company Oscillograph