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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E06C1/38
Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
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E06C1/39
Ladders having platforms; Ladders changeable into platforms
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E06C1/393
Ladders having platforms foldable with the ladder
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