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4 Unusual Measuring Instruments...
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Group of Ampere and Voltmeters...
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Radio-related Service and Laboratory Equipmen...
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3 Oscilloscopes and 1 Measuring Instrument, c...
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Telefunken Type K.W. 61g Wave Meter, 1917...
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19 Measuring Instruments...
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Early French Wavemeter, c. 1918...
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5 Radio Engineering Measuring Devices...
