Tacoma_Daily Ledger
Thursday Apr_24 1930 
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DLBS – Don Lee Broadcasting System which became part of the Mutual Broadcasting System.
KCYS, Kilocycles designation
Well, KCYS really caught my eye, because those are the call letters of the first paying job I had in radio. In the Tri-Cities, KCYS stood for the Columbia, Yakima and Snake rivers. It was the first FM in the area, coming on the air in the 1960’s at 102.7, and owned by (who else?) Three Rivers Broadcasting. It is now KORD-FM playing country music. (I realize this is w-a-y off topic, since FM, me, and the Tri-Cities didn’t even exist in 1930!)