Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1989-04-27
1990-09-04
Haroian, Harry M.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33364, G01C 1702
Patent
active
049533045
ABSTRACT:
The invention relates to a mask compass comprising a case attached to the outer surface of glass of goggles. The compass box is placed inside the casing. Thus the checking of the compass does not interfere with regular diving movements and e.g. cause deviations from the right direction.
REFERENCES:
patent: 1043478 (1912-11-01), Stephenson
patent: 1409808 (1922-03-01), Wood
patent: 2873536 (1959-02-01), Rieger
patent: 2878578 (1959-03-01), Howard
patent: 3210859 (1965-10-01), Fisk et al.
patent: 4402140 (1983-09-01), Nagae
Jansson Per-Olof
Raitmaa Raimo
Haroian Harry M.
Oy Master Instruments Ltd.
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