'THE UNIVERSAL MICROSCOPE' (1927) or
'MICROSCOPE OR FLOROSCOPE' (1886, onward) or
'FLORASCOPE'

SIMILAR MICROSCOPES WERE CALLED:
'PAN-AMERICAN MICROSCOPE' (1901-PAN AMERICAN EXPOSITION) or
'COMBINATION MICROSCOPE' (1903)or
'COMBINATION MICROSCOPE OR FLOROSCOPE'(1905) or
'MICROSCOPE AND FLOROSCOPE COMBINED' (1929) or
'DR KOCH'S FRENCH MICROSCOPE' or
'TWENTIETH CENTURY WONDER'

EXPORTED FROM FRANCE TO MANY COUNTRIES INCLUDING U.S.A., ENGLAND, SPAIN.

c. 1850-1950; this example circa 1927

The instructions which came with this instrument show an image of the original version, rather than the slightly improved version; also note the copyright date, proving that these were made right into the second quarter of the twentieth century.