Gebr. Mittelstrafs, (Mittelstrass), Magdeburg c. 1875

This is a relatively large microscope. It is shown here photographed next to a Zeiss IVa.

The firm Gebr. Mittelstrass, Magdeburg was established by two brothers, Carl and Otto, in 1867. The firm produced and sold a variety of optical, physical, chemical, and measurement apparatus. The above advertisement is from 1903