Process for the optical determination of surface roughness and device for carrying out the process
DE915989C
Microscope for making surface and layer structures visible with the help of a chiaroscuro edge that is sharply depicted on the test body and observed at an angle to the direction of incidence of light
DE910595C
Rose compass with a compass display mirrored in a laterally arranged inclinable sighting device
DE761017C
Prism telescope with prisms resting on the cathetus surfaces
DE908918C
Compass with sighting device
DE758192C
Microphotographic camera
GB515133A
Improvements in glare-free ophthalmoscopes
GB463778A
Self-illuminating magnifier
GB455777A
Improvements in galilean field glasses
DE913706C
Compass for sharp angles
DE620219C
Measuring triangle
DE637416C
A device consisting of a photographic camera and a binocular telescope
DE627621C
Instrument for the objective determination of refraction of the eye
DE569884C
Device for illuminating microscopic objects
DE581536C
Microscope for examinations in incident and transmitted light
DE585705C
Process for the production of hardened eye glasses
DE562330C
Process for hardening optical glasses
DE548159C
Process for hardening optical glasses
DE534005C
Photographic device consisting of binoculars and a photographic camera
