[GreenKeys] United Press International M15 sign on epay

[Jim Haynes]

Comment...in my youth I never saw any of these placards on wire service
Teletype machines.  Of course you knew what the service was because on
the dateline of each item there would be (AP) or (UPI).  I speculate
that these placards came into existence because TV stations started
showing their wire rooms, and the various wire services wanted to be sure
their presence was visible in the picture.