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621.373.1 --- Oscillatoren --- Oscillators, Crystal --- Piezo-electric oscillators --- Quartz oscillators --- Quartz plate oscillators --- Quartz resonators --- Crystallography --- Crystals --- Electron tubes --- Electronics --- Frequency standards --- Oscillators, Electric --- Piezoelectric devices --- Quartz

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Measuring methods in physics --- anno 1800-1899 --- Equipment and Supplies --- 681 <09> --- 529.78 <09> --- 681.2 --- 54.08 --- 389 <09> --- 527 --- Science --- history. --- Precision mechanisms and instruments--Geschiedenis van ... --- Time-measuring instruments. Clock setting, regulating. Time standards. Quartz crystal etc. Sundials. Gnomons--Geschiedenis van ... --- Instrument-making in general. Instrumentation. Measuring instruments and their manufacture. Balances. Weighing devices --- Measurement principles, methods, techniques. Instrumentation --- Metrologie--Geschiedenis van ... --- Nautical and aeronautical astronomy. Navigation --- 527 Nautical and aeronautical astronomy. Navigation --- 389 <09> Metrologie--Geschiedenis van ... --- 54.08 Measurement principles, methods, techniques. Instrumentation --- 681.2 Instrument-making in general. Instrumentation. Measuring instruments and their manufacture. Balances. Weighing devices --- 529.78 <09> Time-measuring instruments. Clock setting, regulating. Time standards. Quartz crystal etc. Sundials. Gnomons--Geschiedenis van ... --- 681 <09> Precision mechanisms and instruments--Geschiedenis van ... --- history --- Metrologie--Geschiedenis van .. --- Metrologie--Geschiedenis van