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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E04F11/022
characterised by the supporting structure
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E04F11/032
Spiral stairways supported by a central column
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