with selectively-operable punches

Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor > Perforating by punching, e.g. with relatively-reciprocating punch and bed > with selectively-operable punches

Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor (perforating by laser beam B23K26/00; subjecting the grinding tools or the abrading medium to vibration, e.g. grinding with ultrasonic frequency, B24B1/04; perforating by sand-blasting B24C; punching cards or tapes for statistical and record purposes G06K1/00) > Perforating by punching, e.g. with relatively-reciprocating punch and bed > with selectively-operable punches