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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7/00
Component parts, supporting parts, or accessories
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E06C7/08
Special construction of longitudinal members, or rungs or other treads
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E06C7/082
Connections between rungs or treads and longitudinal members
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E06C7/087
with a connecting piece installed around the rung
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