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Search results for: Campbell, Charles


 
  • Patent:GB381221 03.10.1932 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to statistical or calculating machines
  • Patent:GB413327 13.07.1934 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines
  • Patent:GB437578 31.10.1935 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating mechanism
  • Patent:GB454247 28.09.1936 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines
  • Patent:GB454248 28.09.1936 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating mechanism
  • Patent:GB454249 28.09.1936 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines
  • Patent:GB454250 28.09.1936 Campbell, Charles (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to counters for calculating machines

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