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CH240270A
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Connection of a plate to a rod-shaped body and method for producing the connection.
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US2249604A
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Controllable electric discharge device
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US2275242A
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Glow discharge tube
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US2267703A
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Modulation
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US2272353A
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Electronic microscope
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US2274215A
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Electronic microscope
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US2270178A
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Arrangement consisting of a plurality of mechanically coupled rotating coil variometers
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US2286428A
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Arrangement for tuning parallel wire lines
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US2276518A
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Telephone system
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US2279441A
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Ultra short wave generator
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US2265394A
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Push-button arrangement
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US2245134A
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Synchronized generator
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US2256171A
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Method of focusing electron microscopes
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US2228958A
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Cathode ray tube
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US2278585A
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Telephone system
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US2282930A
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Switching mechanism and circuit therefor
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US2272315A
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Contact device
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US2277867A
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Electromagnetic self-interrupter
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US2266717A
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Electron microscope
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US2277901A
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Telephone system
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