Notes on the prolongation of letters patent for inventions with the Patents, Designs, and Trade Marks acts, 1883-8, consolidated : the Board of Trade rules and the Patent Office rules and directions : and the new rules of the Judicial Committee of the Privy Council
Notes on the prolongation of letters patent for inventions [microform] : with the Patents, Designs, and Trade Marks acts, 1883-8, consolidated : the Board of Trade rules and the Patent Office rules and directions : and the new rules of the Judicial Committee of the Privy Council / by Gerald John Wheeler.