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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E04F2201/02
Non-undercut connections, e.g. tongue and groove connections
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E04F2201/021
with separate protrusions
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E04F2201/022
with tongue or grooves alternating longitudinally along the edge
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