Authority search results

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Authority search results
Authorized headings		Type of heading	Records
Topical Term: Digital telephone systems see also: Digital communications (Broader heading) Telephone systems (Broader heading)	Details	Topical Term	3 records
Topical Term: Telephone switching systems, Electronic used for/see from: Electronic switching systems (Telephone) see also: Electronic systems (Broader heading) Switching circuits (Broader heading) Switching theory (Broader heading) Telephone, Automatic (Broader heading) Telephone stations (Broader heading) Telephone systems (Broader heading)	Details	Topical Term	3 records
Topical Term: Telephone systems used for/see from: Telephony see also: Telecommunication systems (Broader heading)	Details	Topical Term	1 record