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Triskell shaped spindle size adapters

Believe or not this iks a 45 rpm record insert shaped as a "triskell" symbol!

Actually, the Seeburg Corporation introduced the Seeburg Background Music System in 1959, using a 16⅔ rpm 9-inch record with 2-inch center hole. Each record held 40 minutes of music per side, recorded at 420 grooves per inch.

Columbia and RCA's competition extended to equipment. Some turntables included spindle size adapters, but other turntables required snap-in inserts like this one to adapt RCA's larger 45 rpm spindle size to the smaller spindle size available on nearly all turntables. Shown is one popular design in use for many years.

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Image copyright ©2004 by Daniel P. B. Smith and released under the terms of the Wikipedia license.

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User Dpbsmith on en.wikipedia

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(Reusing this file)
Released under the GNU Free Documentation License.
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Originally from en.wikipedia; description page is (was) here

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