Here is a little of the history, the way I understand it. Feel free to correct me if I'm wrong. I believe it was 1958 when Sinclair rebranded about 50 stations with the triple check logo in 3 cities, Salt Lake City being one of them. The public's response to the new logo was less than positive and the logo was abandoned less than a year later in favor of the new Dino logo.

I know a guy in Idaho that had a triple check that is trapazoid shaped.

Woody, that is a Beeline sign behind it.

Dave