Electrolytic bath for forming a glossy black chromium coating layer
HUT64422A
Eyeglass for operation
HUT41075A
System for the electrolytic treatment of shaped workpieces
HUT41911A
Optical inset for the ski spectacles
HUT42641A
Spectacles application for gas-masks
HUT41683A
Sight-testing ambulance bus
HUT39883A
Hearing aid built in spectacle rim
HU186150B
Process for the removal electrolitically of nickel, chrome ot gold layers from the surface of copper or cupric alloys and equipemnt for carrying out the process
ATA796478A
Method for optimum adjustment of electrolytic polishing, and circuit arrangement therefor
HU176273B
Continuous volume and tone control for hearing aids
