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Eleven enlargements of blood corpuscles and fibrin and a diagram, page, photomechanical print,
LZT26A99_180

Eleven enlargements of blood corpuscles and fibrin...

Timer with a falling ball to measure shutter speed, page, photomechanical print, c. 1888 - in or
LZT26B02_192

Timer with a falling ball to measure shutter speed...