4. Geometrical instruments
  5. Straightedge type
  6. Combined with level

Donald D. Kook

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Calibrated bevel square with integrated electronic level and plu

Geometrical instruments – Straightedge type – Combined with level
Patent

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Electronic level with display scale and audible tone scale

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent

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Hand held sensor and display

Electricity: measuring and testing – Conductor identification or location – Inaccessible
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1532607

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