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3433532
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Patent Grant
3433532
References
Source
Patent Number
3,433,532
Date Filed
Not available
Date Issued
Tuesday, March 18, 1969
56 years ago
CPC
E21D9/1053 - for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently
US Classifications
299 - Mining or in situ disintegration of hard material
175 - Boring or penetrating the earth
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