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- Doctoral Thesis
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https://doi.org/10.3929/ethz-a-000090085Publication status
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GESPRÄCHSZÄHLER + MÜNZAUTOMATEN (TELEFONTECHNIK); CALL COUNTERS + PREPAYMENT APPARATUSES (TELEPHONY)Notes
Diss. Techn.Wiss. ETH Zürich, Nr. 3210, 0000. Ref.: Weber, H. ; Korref.: Baumann, E..More
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ETH Bibliography
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