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8 Large Measuring Instruments, c. 1900-20...
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2 Resistance Bridges and 2 Laboratory Devices...
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6 Galvanometers, c. 1900...
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4 Measuring Bridges, c. 1920...
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5 Large Precision Measuring Instruments, c. 1...
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7 Measuring Instruments, c. 1900-20...
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4 Large Precision Measuring Instruments, c. 1...
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4 Large Brass Precision Measuring Instruments...
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2 Siemens & Halske Precision Instruments...
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3 Measuring Instruments...
