Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04G
SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
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21/00
Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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E04G21/02
Conveying or working-up concrete or similar masses able to be heaped or cast
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E04G21/06
Solidifying concrete, e.g. by application of vacuum before hardening
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E04G21/08
Internal vibrators; , e.g. needle vibrators
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