D pump, yes. Not the DB though. DB (die-cast) came out in mid 1958 and I think Hercules was the first to use it, John Deere 2nd or 3rd.I heard several stories about Vernon Roosa and likely all are nonsense, but who knows? As far as his rotary-distributor pumps go, as I recall? When he came up with model C, I was told just Deere and Caterpillar used it but I have never a Cat with it. We had miserable problems with the CDC pumps, and moderate problems with the early CBCs. But after a few updates, many of those CBCs are still going strong. Pretty good pump at the end of it's official life. That said, I have thrown out many. Kind of wish know I had saved the parts.
As far as the demise of the C? One story I was told was it had something to do with a fight among Roosa's family after he died and who got control of what. I have no idea if there is any truth to it. I know the patent ran out in 1985. Roosa died in 1989. Too late to give him a call and ask him.
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