Catalog of Copyright Entries. Third Series: 1976: January-June (Google eBook)

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Copyright Office, Library of Congress, 1977 - Copyright - 1608 pages
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The Concord Telephone Exchange in Knoxville Tn. had this (ROH) receiver off hook tone that wound up like a siren til it reached a medium pitch sound and went like a horn. It was with this
switch
type: ATT/philps Tel 5ESS-PBX. I was wanting to know what the technical mane for that ROH tone. Please let me know. Thank you. 

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