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797525
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Information
Patent Grant
797525
References
Source
Patent Number
797,525
Date Filed
Not available
Date Issued
Tuesday, August 15, 1905
119 years ago
CPC
E21B7/00 - Special methods or apparatus for drilling
E02D29/077 - Tunnels at least partially built beneath the water-bed characterised by being made by methods involving disturbance thereof all along the location line
US Classifications
405 - Hydraulic and earth engineering
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