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Sicherungstechnik
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Scientific Railway Signalling Symposium 2018 : Darmstadt, 13.06.2018
Colloquium on airborne collision avoidance-TCAS, 5 March 1984
16th annual safe sympos., proc., San Diego, Calif., Oct. 8-12, 1978
Proc. 1982 carnahan conf. on security technology, May 12-14, 1982, Lexington, USA