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| Patents for John George William Gruban | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-191,016,698 | Jun. 15, 1911 | J.G. Gruban | Improvements woodworking machinery | band resaws | |
| GB-191,100,392 | Sep. 14, 1911 | J.G. Gruban | Improvements relating to wood mortising machines | mortising machines | |
| GB-191,102,960 | Dec. 21, 1911 | J.G. Gruban | Improvements in wood moulding, planing and like machines | molders | |