on Apr 15, 2016
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ANTIQUE SPENCER HAEMACYTOMETER FOR COUNTING BLOOD CELLS USING A MICROSCOPE Made by Spencer
A." and "Bright Line Improved Neubauer 10 mm deep patented"
I'm guessing it was used by putting a tiny blood smear in the concave part and the blood cells are counted on tiny "bright line" grid lines on the mirrored surfaces with a 100X microscope
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