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	61.	No cover image available ITU-T. P. 38. Telephone transmission quality subscribers' lines and sets. Transmission characteristics of operator telephone systems (OTS) by International Telecommunication Union Material type: Text; Format: print ; Literary form: Not fiction Publication details: Geneva ITU 1993 Availability: Items available for loan: National Acoustic Laboratories (1)Call number: ITU-T. p. 38. Place hold Add to cart (remove)
	62.	No cover image available ITU-T. p. 65 (03.93). Telephone transmission quality objective electro-acoustical measurements. Objective instrumentation for the determination of loudness ratings by International Telecommunication Union Material type: Text; Format: print ; Literary form: Not fiction Publication details: Geneva ITU 1993 Availability: Items available for loan: National Acoustic Laboratories (1)Call number: ITY-T. p. 65. Place hold Add to cart (remove)
	63.	No cover image available ITU-T. 78.(03/93) Telephone transmission quality measurements related to speech loudness. Subjective testing method for determination of loudness ratings in accordance with recommendation p. 76 by International Telecommunication Union Material type: Text; Format: print ; Literary form: Not fiction Publication details: Geneva ITU 1993 Availability: Items available for loan: National Acoustic Laboratories (1)Call number: ITU-T. P. 78. Place hold Add to cart (remove)
	64.	No cover image available ITU-T K.7. Protection against interference. Protection against acoustic shock. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Geneva ITU 1993 Availability: Items available for loan: National Acoustic Laboratories (1)Call number: ITU-T. K. 7 (1993). Place hold Add to cart (remove)

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