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| Patents for Frederick William Portass | |||||
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| Number | Title | Classification(s) | |||
| GB-103,933 | Improvements in or Relating to Chasing Bar Lathes | ||||
| GB-179,048 | An Improved Stand for Lathes, Small Machines and the like | ||||
| GB-208,348 | Improvements Relating to Compound Rests and the like for Lathes and Machine Tools | ||||