Patent classifications
E
FIXED CONSTRUCTIONS
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E06
DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
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E06C
LADDERS
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E06C1/02
with rigid longitudinal member or members
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E06C1/04
Ladders for resting against objects, e.g. walls poles, trees
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E06C1/12
extensible, e.g. telescopic
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E06C1/125
with tubular longitudinal members nested within each other
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