I spotted this unique looking older telephone on the deli counter of a Polish restaurant in Niles, IL today.
I can't find out much about Telrad other than the fact that the company was founded in 1951 and based in Israel. Telrad mostly focuses on cellular equipment now.
This facility was unique in the fact that I also spotted a Toshiba DK Strata in the office area of the banquet area, so maybe they are operating two systems independently in the same organization.
The Toshiba phone I spotted in the office area is shown below:
The Telrad Digital Telephone: