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bifocal segment measure Pastore Enterprises 1976 View |
bifocal segment measure Raphael's Ltd Early 1970s View |
London Segment Height Determinator London Optical Company Ltd mid 20th c. View |
London Segment Height Determinator London Optical Company Ltd mid 20th c. View |
Seg-Determinator Pell Optical Co; London Optical Company Ltd 20th c. View |
Ultravue Dispensing Template American Optical Company Late 1970s? View |