The first rotating wheel can opener was patented in July 1870 by William Lyman of Meriden , Connecticut , US William W Lyman '' Improvement in can openers '' July 12 , 1870 .
The first rotating wheel can opener was patented in July 1870 by William Lyman of Meriden , Connecticut and produced by the firm Baumgarten in the 1890s . 
 William W. Lyman '' Improvement in can openers '' July 12 , 1870 .