Zeiss binocular microscope. Germany .1960.

This Carl Zeiss binocular microscope model serial number 4,229,941 incorporates a breakthrough. This is the coaxial illumination through the base. The lighting was located behind the microscope and used to have, in addition to the normal light bulb, another fluorescent light device with a mercury vapor lamp, housed in a safety steel box, with a ventilation system using louvers