I read the article to try and find out whose previous record he surpassed. No luck.
Same here. That's what I was curious to know.
Best I could find:
http://roadsidephotos.sabr.org/baseball/voices.htm
Jack Buck 47 years with the Cardinals
Ernie Harwell 42 consecutive years with the Tigers
Bob Murphy 41 years with the Mets
Unless it’s a mistake, maybe it’s something like an announcer for the San Diego Padres when they were a Pacific Coast League team, but they later became a major league team....not exactly the same franchise though.