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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E04F2011/0203
Miscellaneous features of stairways not otherwise provided for
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E04F2011/0205
Stairways characterised by the use of specific materials for the supporting structure of the treads
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E04F2011/021
mainly of stone or stone like materials, e.g. concrete; mainly of glass
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