Thomas Hancock (8 May 1786 – 26 March 1865), elder brother of inventor Walter Hancock, was an English inventor who founded the British rubber industry. He invented the masticator, a machine that shredded rubber scraps and which allowed rubber to be recycled after being formed into blocks or sheets.
Walter Hancock (16 June 1799 – 14 May 1852) was an English inventor of the Victorian period. He is chiefly remembered for his steam-powered road vehicles, but also received a patent for preparing and cutting natural rubber into sheets. He was the younger brother of Thomas Hancock, the inventor of rubber mastication who is also claimed by some to be the inventor of rubber vulcanization.