It was used on the original pickups that Leo Fender (founder of Fender Guitars) created for the Stratocaster, Telecaster, and the Precision Bass.
The StingRay's two-band active equalizer, high output humbucking pickup, and smooth satin finished neck became a favorite of many influential bassists, including Louis Johnson, John Deacon, and Flea.
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Several pioneering manufacturers of the electric guitar were first famous for their work on the then more popular electric steel guitar, among them Adolph Rickenbacker, Paul Bigsby and Leo Fender.
He established contact with industry luminaries such as Leo Fender, Les Paul and Seth Lover (inventor of the humbucking pickup) and continued learning about and making pickups.