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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15/00
Forms or shutterings for making openings, cavities, slits, or channels
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E04G15/06
for cavities or channels in walls of floors, e.g. for making chimneys
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E04G15/065
with mechanical means to modify the section
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