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Tandem sub
Est. expiryApr 1, 2039(~12.7 yrs left)· nominal 20-yr term from priority
Inventors:Shelby L. Sullivan
E21B 43/116E21B 43/117E21B 43/1185E21B 43/119
96
PatentIndex Score
6
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92
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1
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The ornamental design for a tandem sub, as shown and described.Cited by (0)
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