Patent classifications
E
FIXED CONSTRUCTIONS
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E06
DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
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E06B
FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
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9/00
Screening or protective devices for; wall or similar; openings, with or without operating or securing mechanisms; Closures of similar construction
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E06B9/56
Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
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E06B9/68
Operating devices or mechanisms, e.g. with electric drive
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E06B2009/6872
using counters to determine shutter position
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