postal charge meters; computers, computer peripherals, computer operating programs, computer software for music and art, data processing apparatus and instruments, all for keying, displaying, printing, recording, transmitting, receiving, storing, distributing and reproducing data; blank magnetic and optical discs and magnetic tape, all for use in recording and bearing recorded sound and/or data; cassettes and cartridges, all for the holding of discs and tapes; data feeding and data plotting a...