Here's a link to the answer:
http://elabs6.com/functions/message_view.html?mid=848507&mlid=29661&siteid=28768&uid=ea9b4dc0ff
Indeed, these chimes were used for radio station identification.
Thanks to all who provided interesting links!
Craig Cullum, Engineering Technologist, AMTELCO
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Please visit us at www.amtelco.com
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