4. Electric heating
  5. Metal heating
  6. By arc

Francis Bell

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Method and apparatus for measuring the geometrical structure...

Optics: measuring and testing – Lens or reflective image former testing
Reexamination Certificate

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Method for making an object made of translucent synthetic...

Electric heating – Metal heating – By arc
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2126107

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