Early 10-inch LP records-circa 1948-53

[Betamax]

Just wondering if anyone here has seen or heard of the early 10-inch LPs(the same size as a regular 10-inch 78 rpm record) I have a few of these early LPs from Decca, RCA Victor, Columbia, London Records, Brunswick Records, Varsity Records and from maybe another label as well. Columbia introduced the LP record in 1948, but RCA Victor had also a 33 1/3 record format from 1931-32 as well. The first Columbia LP record had a blue label in 1948, while the first 45 rpm record was made of a transparent green vinyl with a green label by RCA Victor in 1949. Those early 10 inch LPs are very hard to find, I also might add.