"atkinson, j . "
telephony vol. i: general principles and manual exchange systems/ j.. atkinson - 1 ed. - uk : pitman 1947. - "xii, 514p.; 25 cm."
hard cover
--
621. 385 atk
telephony vol. i: general principles and manual exchange systems/ j.. atkinson - 1 ed. - uk : pitman 1947. - "xii, 514p.; 25 cm."
hard cover
--
621. 385 atk