4. Geometrical instruments
  5. Area integrators
  6. Electrical

James E. Lawler

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Barium light source method and apparatus

Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Reexamination Certificate

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Device for determining angles

Geometrical instruments – Area integrators – Electrical
Patent

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Profile ID: LFUS-PAI-P-1982031

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