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General Radio (GenRad)
Model 650-A and Model 650-P1 Impedance Bridge Operating and Maintenance Instructions (30 pages, 120MB, 1933) - owner operating instructions, service and maintenance manual.
Model 650-A Impedance Bridge Operating Instructions (15 pages, 60MB, 1933) - owner operating instructions manual.
Model 650-A Impedance Bridge Service and Maintenance Notes (4 pages, 20MB, 1933)- additional service and maintenance notes for service and maintenance manual.