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Bruce Refracting Unit Automatic Sight Testing Co Ltd c.1889 View |
Optician's chair & British Refracting Unit Calthorpe (maker); Ellis Optical Co (maker) c.1933 View |
Raphael's Patent Opsiometer J. Raphael & Co c.1891 View |
Stearman Refracting Unit Stearman Optical Co Ltd c.1959 View |