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981-210-100_I2_Apr69_SS309_Autovon_Desc.pdf

981-210-100 I2, Switching System No. 309 (AUTOVON)
April 1969.  General Description of the No. 309 Switching System.  Comprised of equipment required at a 4-wire subscriber station to enable the customer to establish both voice and data transmission with other stations on switchboard services such as the AUTOVON (AUTOmatic VOice Network).

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