Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04F
FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
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11/00
Stairways, ramps, or like structures; Balustrades; Handrails
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E04F11/02
Stairways; Layouts thereof
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E04F11/116
of stone, concrete or like material; or with an upper layer of stone or stone like material, e.g. ceramics, concrete; of glass or with an upper layer of glass
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