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2893692
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Information
Patent Grant
2893692
References
Source
Patent Number
2,893,692
Date Filed
Not available
Date Issued
Tuesday, July 7, 1959
65 years ago
CPC
E21B4/12 - Electrically operated hammers
Y10T74/10 - High frequency vibratory devices
US Classifications
175 - Boring or penetrating the earth
074 - Machine element or mechanism
310 - Electrical generator or motor structure
318 - Electricity: motive power systems
335 - Electricity: magnetically operated switches, magnets, and electromagnets
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