4. Geometrical instruments
  5. Gauge
  6. Circular size

Charles W. Donaldson

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Diameter gauge

Geometrical instruments – Area integrators – Electrical
Patent

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Diameter gauge

Geometrical instruments – Gauge – Circular size
Patent

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Endoscope

Optics: measuring and testing – Inspection of flaws or impurities – Bore inspection
Patent

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Fixture device

Geometrical instruments – Gauge – Comparison with a standard
Patent

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Method for measuring the contour of a surface

Optics: measuring and testing – By polarized light examination – With light attenuation
Patent

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Profile ID: LFUS-PAI-P-33400

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