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3365893
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Patent Grant
3365893
References
Source
Patent Number
3,365,893
Date Filed
Not available
Date Issued
Tuesday, January 30, 1968
56 years ago
CPC
E21D23/0052 - with advancing shifting devices connected therewith
E21D23/0047 - without essential shifting devices
US Classifications
405 - Hydraulic and earth engineering
248 - Supports
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