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- [4] MODEL-S-1P LOUDSPEAKER TELEPHONE SET DESIGN AND CONSTRUCTION REVIEW OF THE ELECTRICAL COMMUNICATIONS LABORATORIES, 1979, 27 (5-6): : 368 - 374
- [5] ACOUSTIC DESIGN OF THE MODEL-S-1P LOUDSPEAKER TELEPHONE SET REVIEW OF THE ELECTRICAL COMMUNICATIONS LABORATORIES, 1979, 27 (5-6): : 358 - 367
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- [7] ACOUSTIC DESIGN OF THE MODEL S-1P LOUDSPEAKER TELEPHONE SET. Reports of the Electrical Communication Laboratory, 1979, 27 (5-6): : 358 - 367