...from RCA in June of 1949...

"All record changers require a selecting mechanism of some sort to separate individual records from the stack. With records of constant thickness, all practical designs of selecting means cause some damage to the edge, body, or center hole area since the records have to be forced apart or slid one against the other to effect selection. With a small center hole and the heavy records commonly used, high stresses occur around the center hole and record damage results. A small center hole does not permit record stability on the spindle without edge support or complex spindle mechanism. Further, the small hole makes loading difficult."