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GB384099A
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Electron-emitting cathode heated by an auxiliary glow discharge
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GB382454A
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Discharge tube for resistance amplifying
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GB365303A
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Electron tube with incandescent cathode
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GB347833A
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Portable electric lamp
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US1733023A
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Adjustable high ohmic resistance and method of manufacturing same
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GB308749A
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Adjustable high ohmic resistances and the method of manufacturing the same
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ES103826A1
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Procedure and installation to avoid the inconvenience caused by the oscillatory and rotation movements.
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GB191319838A
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Improvements in Machines for Sealing Supporting Wires into the Beds of the Glass Rods of Metal Filament Electric Incandescent Lamps.
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GB191319316A
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Improvements in Machines for Producing Beads on Glass Rods.
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GB191303112A
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An Improved Process for Manufacturing Ductile, Tungsten, Wires or Filaments.
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CA222660A
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Incandescent lamp making machine
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CA222659A
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Machine for producing beads on glass rods
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