E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/66
E21D 15/02 (2006.01)
Patent
CA 1138662
A B S T R A C T O F D I S C L O S U R E A prop intended particularly for use in underground mines, is made of timber. At one or both ends of the prop, a reduced diameter portion is formed. The rest of the prop has a larger diameter. At the end or ends of the larger diameter portion adjacent the reduced diameter portion(s), a restraining ring surrounds the prop.
363772
Mine Support Systems (proprietary) Limited
Robic Robic & Associes/associates
LandOfFree
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