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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2201/00
Joining sheets or plates or panels
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E04F2201/04
Other details of tongues or grooves
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E04F2201/043
with tongues and grooves being formed by projecting or recessed parts of the panel layers
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