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Parkinson J, of Bradford
J Parkinson, of Bradford.
J Parkinson of Shipley near Leeds, were best known for their Parkson milling machines, Sunderland gear shapers, and Parkinson vises (always spelt the American way).
Here’s a nice little 1882 lathe by J Parkinson (of Bradford rather than Shipley, but presumably the same).
Source; Bradford museum and practical machinist forum