Survey marker

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Visual

Patent

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1005

Patent

active

D03991580

REFERENCES:
patent: D252075 (1979-06-01), Cory et al.
patent: D277739 (1985-02-01), Grammas et al.
patent: D317580 (1991-06-01), Thurston
patent: D320172 (1991-09-01), Thurston
patent: D338631 (1993-08-01), Bravermann
patent: D358111 (1995-05-01), Gregory
patent: 3380428 (1968-04-01), Abrams

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