U.S. federal trademark · Serial No. 71682328 · Reg. No. 0625158
PLUMBER'S TEST BALLS COMPRISING AN INFLATABLE CYLINDRICAL BODY ADAPTED TO BE INSERTED INTO A TUBULAR MEMBER SUCH AS A SOIL PIPE AND INFLATED THEREIN TO TEMPORARILY SEAL THE INTERIOR THEREOF, THEREBY TO FACILITATE TESTING THE SOIL PIPE FOR LEAKS
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