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| Patents for John Emery Caster | |||||
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| Picture | Number | Date | Patentee | Title | |
 | GB-278,001 | Jul. 05, 1928 | J.E. Caster | Improvements in Machines for Grinding Spherical Articles | |
 | GB-278,003 | Jul. 05, 1928 | J.E. Caster | Improvements in Centreless Grinding Machines | |
 | GB-278,002 | Sep. 27, 1928 | J.E. Caster | Improvements in and relating to Grinding Spherical Articles | |
 | GB-294,594 | Nov. 15, 1928 | J.E. Caster | Improvements in Machines for Grinding Spherical Articles | |