I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
Measuring, analyzing and solving environmental problems is paramount for the successful HVAC service technician. The EM20 Thermo Anemometer diagnoses and solves air flow problems in HVAC systems
Professional DT-9935 LCR Meter Kelvin 4-wire Ohm Inductance Capacitance Q, D and q Theta Tester New! Product Description This is a brand new DT-9935 professional LCR tester from Ruby Electronics. This top-of-the-line LCR tester is designed to test inductance, capacitance and resistance with great a
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