Drilldown: Patents

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Patents > Year granted: 1910 - 1919 & Office : BE or NL or NZ or US or Other & Inventor country: US & Tech fields: control & Patent agent: None

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USPC 244/80 (5) · None (3) · USPC 244/90R (3) · USPC 244/233 (2) · USPC 244/131 (2)
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