[Milsurplus] US Navy MAR manual on line

[Nick England]

I have just posted pdf downloads for the manual on the Navy UHF
transmitter-receiver model MAR
http://www.navy-radio.com/manuals/mar-1944.htm

More info and photos would be appreciated.
The contract is dated May 1944 - were these in use during WW2?
What is the relationship between MAR and RDR?
Was there a transmitter only version (TDR?) ?
Etc.
cheers,
Nick K4NYW
www.navy-radio.com