Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like ; Accessories therefor involving optical auxiliary means, e.g. optical projection form grinding machines combined with electrical transmission means, e.g. controlled by photoelectric cells
Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like ; Accessories therefor involving optical auxiliary means, e.g. optical projection form grinding machines combined with electrical transmission means, e.g. controlled by photoelectric cells