There are some interesting facts in this video. Firstly there were no juke-boxes at the implimentation of the 45. Secondly the use of a large centre hole made it far easier to hold up to ten stacked 45's rather than the small holed versions.

It's a rather long video, but for the demographics of TG members might be of interest.

To view just a specific part of the video FF to the 34 minute section of this video