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Creator Bausch & Lomb Optical Company Remove constraint Creator: Bausch & Lomb Optical Company Place New York (State)--Rochester Remove constraint Place: New York (State)--Rochester Subject Refractometers Remove constraint Subject: Refractometers Date 1930 to 1931 Remove constraint Date: <span class="from" data-blrl-begin="1930">1930</span> to <span class="to" data-blrl-end="1931">1931</span>

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