GB191018109A
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Improvements in Apparatus for the Manufacture of Lenses.
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US1084529A
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Apparatus for the manufacture of bifocal lenses.
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CA122563A
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Manufacture of bi-focal lenses
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GB190428823A
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Improvements in Bi-focal Lenses and their Manufacture, and in Apparatus to be employed in the said Manufacture.
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US775963A
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Automatic magic-lantern apparatus.
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GB190226470A
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Improvements in Automatic Magic Lantern Apparatus
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US1072419A
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Apparatus for the manufacture of lenses.
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CA227544A
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Machine for grinding lenses
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CA227545A
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Machine for grinding bi-focal lenses
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