My grandfather worked for a company that built industrial sized knitting machines, and his job was to ensure they were installed correctly and to help get them

My grandfather worked for a company that built industrial sized knitting machines, and his job was to ensure they were installed correctly and to help get them up and running. One frequent destination was Czechoslovakia, where he had a "handler" who had to be with him at all times when he wasn't in the hotel. She eventually became friends of the family and corresponded regularly with the family well into the late '90's.