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with dog-clutch or pin-and-hole connection
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CPC
E21D15/10
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D15/00
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E21D15/10
with dog-clutch or pin-and-hole connection
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Patents Grants
last 30 patents
Information
Patent Grant
1782903
Patent number
1,782,903
Issue date
Nov 25, 1930
E04 - BUILDING
Patents Applications
last 30 patents
CPC
E21D15/10
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