Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F21
LIGHTING
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F21V
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
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11/00
Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
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F21V11/08
using diaphragms containing one or more apertures
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