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3843988
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Information
Patent Grant
3843988
References
Source
Patent Number
3,843,988
Date Filed
Not available
Date Issued
Tuesday, October 29, 1974
50 years ago
CPC
G04D3/0069 - for working with non-mechanical means
E01D19/02 - Piers Abutments; Protecting same against drifting ice
E02D29/05 - at least part of the cross-section being constructed in an open excavation or from the ground surface
E21D9/005 - by forcing prefabricated elements through the ground
G04D7/1285 - whereby the adjustment device works on the mainspring
E01B2/00 - General structure of permanent way
US Classifications
014 - Bridges
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