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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E06C1/14
Ladders capable of standing by themselves
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E06C1/24
Non-hinged; free-standing ladders
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