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The PRO4, introduced in 1962, was collected by the Smithsonian Institution in 1972. Discontinued: 1967.

The Stereo Dental setup, a revolutionary idea to ease pain and anxiety during dental work, in 1962.

The SP3X stereophone, introduced in 1964, discontinued in 1967.

The SP3XC stereophone, introduced in 1966, discontinued in 1974.

In 1966 the Beatles were all the rage, and so was the Koss Beatlephone, featuring earcups with inset paintings of the fab four.

The Beatlephone stereophone was introduced in 1966 and discontinued in 1967.

Another shot of the Beatlephone stereophone.

The ESP/6, the first electrostatic stereophone, introduced in 1968, discontinued in 1973.

The ESP7 Electrostatic Stereophone, introduced in 1969, discontinued in 1972.