1980 'Gibson Pickups & Parts' brochure, page 6: Crank machine heads.
Now you can give it the ol' fast arm. With revolutionary new Crank Machine Heads. They're so unique, we've even applied for a patent. Each tuner has a winding lever tucked right in. When you're performing, it stays out of sight. But when you're ready to re-string, you just flip 'em out. Wind up for the pitch. And you're ready to play. Crank Machine Heads in chrome or gold.
In February 1981 a set of six Crank machine heads had a list price of $98.95 (chrome) or $131.95 (gold).
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