Simpson.
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Simpson Electronic Company. Simpson: Instruments that Stay Accurate. 260 Add-A-Tester Adapter Operator's Manual. Transistor Tester Model 650 Bibliography
Simpson Electronic Company. Simpson: Instruments that Stay Accurate. 260 Add-A-Tester Adapter Operator's Manual. Transistor Tester Model 650. Includes the following sections: General Description, Operating Instructions, Theory of Operation, and Maintenance.