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used in making spectacles, cameras, cinema projectors, microscopes and telescopes.
Vicky001 answered the question on September 24, 2017 at 19:51
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Date posted: September 24, 2017. Answers (1)
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Date posted: September 24, 2017. Answers (1)
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Date posted: September 24, 2017. Answers (1)
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Date posted: September 23, 2017. Answers (1)
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Date posted: September 22, 2017. Answers (1)
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Date posted: September 21, 2017. Answers (1)
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Date posted: September 21, 2017. Answers (1)