Rokkor

Rokkor was a brand name used for all Chiyoda Kōgaku Seikō and later Minolta lenses between 1940 and 1980,[1] including a few which were marketed and sold by other companies like Leica.

[1] The company's founder Kazuo Tashima [ja] wanted the name to symbolize the high quality in optics.

As the only officially released auto-focus Rokkor ever, this lens was incorporated into the Minolta TC-1 135 film compact camera.

[1] Many continued to call at least the manual-focus Minolta SR-mount lenses "Rokkors" long after the name was dropped.

There are now even totally unrelated pseudo-brands named Rokunar and Rokinon trying to capitalize on the power of Minolta's brand.