26 ELECTRONIC TEACHING DEVICES UTILIZING MAGNETIC TAPES-NAMELY, PROGRAMMERS FOR RECORDING AND ENCODING THE TAPES, REPRODUCERS FOR REPRODUCING AND DECODING THE TAPES, AND PRECODED AND PRERECORDED TAPES
FIRST USE JULY 5, 1963, ON PROGRAMMERS; IN COMMERCE JULY 5, 1963. FIRST USE JULY 5, 1963, ON PROGRAMMERS; IN COMMERCE JULY 5, 1963.