Vintage Direct current milliammeter model C Sensitive research instrument comp

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Honeywell MM2 Milliamperes Meter Gauge,Preowned Direct Current

Sensitive Research Instrument Corporation Amperes Direct Current Model UMI

Vintage TRIPOLET D.C. MILLIAMPERES 0- 100MA USA Panel Meter Model #321

Vintage Sensitive Research Direct Current Meter.

Vintage Sensitive Research Instrument Model UP Milliamperes Direct Current Meter

Jewell Direct Current MILLIAMPERES METER, 0-500, pattern 54