4. Geometrical instruments
  5. Straight-line light ray type
  6. With magnetic compass

Benjamin D. Pollack

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Pin tumbler lock cylinder

Locks – Operating mechanism – Key
Patent

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Pin tumbler lock with anti-impressioning feature

Locks – Operating mechanism – Key
Patent

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Pin tumbler lock with pull resistant plug

Locks – Operating mechanism – Key
Patent

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Wrist compass and transit

Geometrical instruments – Straight-line light ray type – With magnetic compass
Patent

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