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The yellow insert to play a 45 large spindle single on a small spindle phonograph (they call them turntables now)
Yeah, that one. I recognized and owned the 45 inserts.
We had this something like this one, too. I had RCA record player that folded up and it used the tube.
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Along with not needing the plastic insert for 45's... This also allowed you to stack the records and drop one at a time... coarse we all new that... LOL
Since a few of you have grabbed onto the old record player stuff, here's another one, especially for the younger crowd.....