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How did sales in the ophthalmic goods industry change from the 1960s to the 1970s?
Wiki User
∙ 13y ago
Wholesale billings for the overall optical industry increased from $400 million in 1959 to $900 million by 1969, and then doubled to nearly $2 billion by the end of the 1970s.
Wiki User
∙ 13y ago
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