Geometrical instruments – Straight-line light ray type – Vertical angle
Patent
1995-11-20
1997-01-21
Fulton, Christopher W.
Geometrical instruments
Straight-line light ray type
Vertical angle
33283, 33277, 356 20, G01C 312, G01C 310
Patent
active
055949940
ABSTRACT:
A hand held device adapted to be used by an archer situated in an elevated position to aid in the determination of the approximate ground distance to a stationary or moving target in a simple and efficient manner in order that he might thereby increase his chances of hitting the target.
REFERENCES:
patent: 2279321 (1942-04-01), Janssen
patent: 5467531 (1995-11-01), David
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