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"World Radio TV Handbok 1978" - page 47
Interview of Ray Midkiff, Father of the DSR and MSR Main Marine receivers
Just rcvd. your e-mail on Drake products. The RR1, RR2, and RR3 rcvrs were modified versions of the SPR4 Rcvrs. designed to meet the Marine Reserve standards. They were designed by Bill Robertson (no longer with Drake) and Steve Koogler (presently at Drake).
I designed the DSR-1 and DSR-2 receives intended as a commercial or laboratory synthesized all band unit and also the MSR-2 unit that was designed to meet the standards for a Marine Mains Rcvr.
The MR-3 (repackaged R7) would not have met the Mains spec.
I moved from the amateur division to start and manage the Marine division and we were quite successful until the oil crisis occurred in the 70's and Europe quit building new ships and our Marine business fell off and I moved back to manage the Amateur division.
I retired from Drake in Dec. of 1986 and started with a company in Cincinnati (Xetron Corporation, a division of Westinghouse). I retired from there in mid 1995 but still do occasional consulting work for them. I hope this answers your questions. Nice hearing from you.
Regards.
Ray Midkiff