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'Bondwell' opticians slide rule C. W. Dixey & Son Ltd c.1905 View |
Aristo 80148 optician's slide rule / Rechenstab fur Optik Dennert & Pape 20th c. View |
Aristo slide rule and case Dennert & Pape 20th c. View |
Bennett Slide Rule G. Nissel & Company Ltd; Blundell Harling Ltd 1970s? View |
Bennett Slide Rule G. Nissel & Company Ltd 1950s? View |
Bennett Slide Rule G. Nissel & Company Ltd 1960s? View |
circular slide rule for contact lens surfacing calculations Mid 20th c. View |
contact lens measuring rule Johnson & Johnson Medical Ltd 2010 View |
contact lens measuring rule American Optical Co Late 20th c. View |
contact lenses slide rule Lunelle Soft Contact Lenses Early 1990s View |
CSI Polycon - Vertex Distance Conversion Syntex Ophthalmics Inc 1980s View |
DuraSoft Optifit Toric - Vertex Distance Conversion Wesley-Jessen Inc December 1996 View |
Lunelle Soft Contact Lenses rule Essilor; Lunelle Soft Contact Lenses 1980s View |
Nissel (Bennett) contact lens slide rule G. Nissel & Company Ltd 1960s? View |
ophthalmic slide rule Nitsche & Gunther mid 20th c. View |
optometrist's slide rule Carl Zeiss (Jena) 20th c. View |
Orthops Rule Raphael's Ltd 20th c. View |
Orthops Slide Rule Raphael's Ltd 2nd quarter 20th c. View |
Orthops Slide Rule Raphael's Ltd 2nd quarter 20th c. View |
Orthops slide rule Raphael's Ltd 2nd quarter 20th c. View |
Orthops Slide Rule Raphael's Ltd Mid 20th c. View |
Orthops Slide Rule Mid 20th c. View |
Orthops Slide Rule used at Heriot Watt College Raphael's Ltd Mid 20th c. View |
Polycon II Initial Fitting Guide Sola-Syntex Ophthalmics Post 1985 View |
Prototype Ridley Slide Rule Keeler 1948 View |
Quadrante 74 slide rule Lozza Late 20th c. View |
Syze rule Raphael's Ltd 1930s? View |
Vertex Distance Conversion Calculator Association of Dispensing Opticians; Stanleigh Rule Co. 1960s View |
Vertex Distance Conversion Disc Rayner Mid 20th c. View |
Vertex Slide Rule Obrig Laboratories (Great Britain) Ltd 1960s? View |