1N3020B semiconductor manufactured by United Technical Publications, listed as 1N3020B (circa 1965).

1N2974A semiconductor manufactured by United Technical Publications, listed as 1N2974A (circa 1965).

1N3020A semiconductor manufactured by United Technical Publications, listed as 1N3020A (circa 1965).

1N2974 semiconductor manufactured by United Technical Publications, listed as 1N2974 (circa 1965).

1N2973B semiconductor manufactured by United Technical Publications, listed as 1N2973B (circa 1965).

1N3019B semiconductor manufactured by United Technical Publications, listed as 1N3019B (circa 1965).

1N2973A semiconductor manufactured by United Technical Publications, listed as 1N2973A (circa 1965).

1N3019A semiconductor manufactured by United Technical Publications, listed as 1N3019A (circa 1965).

1N2973 semiconductor manufactured by United Technical Publications, listed as 1N2973 (circa 1965).

1N3019 semiconductor manufactured by United Technical Publications, listed as 1N3019 (circa 1965).

1N2972B semiconductor manufactured by United Technical Publications, listed as 1N2972B (circa 1965).

1N3018B semiconductor manufactured by United Technical Publications, listed as 1N3018B (circa 1965).

1N2972A semiconductor manufactured by United Technical Publications, listed as 1N2972A (circa 1965).

1N3018A semiconductor manufactured by United Technical Publications, listed as 1N3018A (circa 1965).

1N2972 semiconductor manufactured by United Technical Publications, listed as 1N2972 (circa 1965).

1N3018 semiconductor manufactured by United Technical Publications, listed as 1N3018 (circa 1965).

1N2971B semiconductor manufactured by United Technical Publications, listed as 1N2971B (circa 1965).

1N3017B semiconductor manufactured by United Technical Publications, listed as 1N3017B (circa 1965).

1N2971A semiconductor manufactured by United Technical Publications, listed as 1N2971A (circa 1965).

1N3017A semiconductor manufactured by United Technical Publications, listed as 1N3017A (circa 1965).