4. H - Electricity
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Electric discharge tubes

H - Electricity – 01 – J

Patent

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Details

313/141

H01J 1/52 (2006.01)

Patent

CA 474254

Johannes Marinus Van Hofweegan

H - Electricity – 01 – J
Inventor

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Kornelis Swier Knol

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N.v. Philips Gloeilampenfabrieken

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