Self-Acting Mule.-Sharp & Roberts Principle, by P. MacGregor, Manchester', 1874. Richard Roberts (1789-1864) was a British patternmaker and engineer whose development of high-precision machine tools contributed to the birth of production engineering and mass production. From Popular Encyclopaedia or Conversations Lexicon, by A. Whitelaw. (Blackie & Son, Limited, London, Glasgow & Edinburgh, 1874) | |
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