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Not sure if anyone helped you out, but when I researched this system awhile back, I found out that the cables/connectors have several names.
Telco 50
Centronics 50
CN50
SCSI I
These 50-pin cables are not too difficult to find; I purchased several 50 feet-long cables from a computer cable store. Look for 25-twisted pair, shielded cable.
Because the Furman HRM-THRU part number is supposedly difficult to source (or might be discontinued), search for Centronics 50 F/F gender changers (make sure it is not a terminator).
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