4. Geometrical instruments
  5. Straight-line light ray type
  6. Alignment device

William Hersey

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Apparatus for producing a reference plane

Geometrical instruments – Straight-line light ray type – Alignment device
Reexamination Certificate

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Laser level detector

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Design Patent

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Laser-based tool for indicating level, plumb and square

Geometrical instruments – Straight-line light ray type – Alignment device
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2720479

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