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Grid structure for electron discharge devices
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Method of and apparatus for manufacturing small-size gas-filled lamps
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Electron-discharge device
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Piezoelectric crystal holder
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Mount for electron-emission devices and method of making
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Filament-tensioning means
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多箔シール型放電灯
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Method of making an electric incandescent lamp, and electric lamp made in accordance with the method
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Method for arranging plurality of line filaments above the grid electrode in a fluorescent displaying tube
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Electron-discharge device
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Mount for radiotubes
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Mount for electron discharge devices
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Reed switch manufacture
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活性炭素繊維エレメント
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高圧放電ランプ
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