Category:Electrometer tubes
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Media in category "Electrometer tubes"
The following 3 files are in this category, out of 3 total.
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Elektrometerroehren.PNG 521 × 647; 74 KB
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Em 4 1967.jpg 472 × 1,199; 94 KB
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Em 6 1963.jpg 522 × 1,115; 99 KB
