USD230738S - Telephone test and talk-line monitoring switch apparatus - Google Patents
Telephone test and talk-line monitoring switch apparatus Download PDFInfo
- Publication number
- USD230738S USD230738S US D230738 S USD230738 S US D230738S
- Authority
- US
- United States
- Prior art keywords
- talk
- monitoring switch
- switch apparatus
- line monitoring
- telephone test
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Des. 230,738 Patented Mar. 12, 1974 United States Patent O we TELEPHONE TEST AND TALK-LINE MONITORING SWITCH APPARATUS Paul V. De Luca, Port Washin Carney, Valley Stream. N.Y tems C0rp.. Roslyn, N.Y.
gton, and William V. assignors to Porta Sys- Filed Mar. 29, 1972, Ser. No. 239,402
Term of patent 14 years Int. Cl. D14-03 Cl. D26-14 A Des. 230, 738
PAGE 2 FIG. 1 is a perspective view of the telephone test and References Cited :jallr-line monitoring switch apparatus embodying our new UNITED STATES PATENTS esmn " D. 213 372 2/1969 Gross D26-l3 R 2 i t t z t 1s '1 rear mm of the "lpplflillfl deptc ed 1n 2 2 6/1972 D Luca H D26-MA FIG. 3 is a front view of the apparatus shown in FIG. 1: 8 g FIG. 4 is a bottom plan view of the apparatus depicted 2 19 P in FIG. 1: and
FIG. 5 is a side view of the telephone test and talk-line BERNARD ANSHER Pr'mary Examiner monitoring switch apparatus depicted in FIG. 1.
We claim:
The ornamental design for a telephone test and talkline monitoring switch apparatus. substantially as shown.
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