[R-390] CY-979A question

[Tom Chirhart]

I recently located and obtained an early Collins R-390 (non-A) SN 7XX,
first run 1951. It came with a Stromberg Carlson a division of General
Dynamics CY-979A/URR. Government contract dated is 1958 on the
nomenclature tag.

Question is: 

Did Collins also manufacture the CY-979A? How many others made these
aluminum cabinets if others made them?

Thanks in advance.

73

Tom K4NCG