Wide angle fresnel lens array for infrared motion detector syste

Details Wide angle fresnel lens array for infrared motion detector syste Wide angle fresnel lens array for infrared motion detector syste

1988-11-07

1991-04-02

Lucas, Susan J.

Lighting

Light fixture

Element or attachment

D10121

Patent

active

D03159663

REFERENCES:
patent: 1399749 (1921-12-01), Conklin
patent: 1970358 (1934-08-01), Bull et al.
patent: 3463118 (1969-08-01), Wood
patent: 3708222 (1973-01-01), Stern
patent: 3883733 (1975-05-01), Nagel
patent: 4772094 (1988-09-01), Sheiman

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