Patents
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Learn MoreKeywords and boolean syntax (USPTO or EPO format): seat belt searches these two words, or their plurals and close synonyms. "seat belt" searches this exact phrase, in order. -seat -belt searches for documents not containing either word.
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Photorheostat including discharge lamp and masking means and utilizing length of discharge
US3414730A
United States
- Other languages
English - Inventor
Nicolas Michel - Current Assignee
- CIE IND FRANCAISE TUBES ELECT
- INDUSTRIELLE FRANCAISE DES TUBES ELECTRONIQUES Cie SA