Instant placement down rod

Details Instant placement down rod Instant placement down rod

1990-03-23

1991-11-26

Cuchlinski, Jr., William A.

Geometrical instruments

Straight-line light ray type

Alignment device

33286, G01C 1500

Patent

active

050672452

ABSTRACT:
A combination down marker and football position determining device for use by football game officials to indicate the down of play and the location of the football relative to the sideline of the football field. A compound prism member mounted within the marker rod allows quick and accurate position determination.

REFERENCES:
patent: 2335066 (1943-11-01), LaMar
patent: 2869238 (1959-01-01), Sterling
patent: 2900727 (1959-08-01), Clime
patent: 3300861 (1967-01-01), Lily
patent: 3482317 (1969-12-01), Truax
patent: 3752588 (1973-08-01), Chapman
patent: 4090708 (1978-05-01), McPeak
patent: 4764010 (1988-08-01), Buchmann et al.

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