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3138933
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Information
Patent Grant
3138933
References
Source
Patent Number
3,138,933
Date Filed
Not available
Date Issued
Tuesday, June 30, 1964
60 years ago
CPC
E21D9/06 - Making by using a driving shield
E21D9/04 - Driving tunnels or galleries through loose materials Apparatus therefor not otherwise provided for
E21D9/065 - with devices for provisionally supporting the front face
E21D9/093 - Control of the driving shield
E21D11/10 - with concrete cast in situ Shuttering also lost shutterings
E21D19/00 - Provisional protective covers for working space
E21D19/04 - for use in drifting galleries
E21D23/0095 - Temporary supports at the driving front
US Classifications
405 - Hydraulic and earth engineering
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