You got it right, Riot. I was close,but didn't read the info carefully enough to catch all the details. Also, interesting to note that it has the older spelling of the company name, Rickenbacher.
"1934 to 1949: "Rickenbacher" is spelled with an "h", not "k" in the "bacher" portion of the name.
1950 to present: "Rickenbacker" spelled with a "k". "
So,since they first appeared in 1946, I guess that narrows the dating down to 1946 - 1949.