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@mattblaze @SteveBellovin It's "the Search for Safety - A History of Railroad Signals and the People Who Made Them"
by the Union Switch & Signal Division, American Standard Inc. 1981
No ISBN number.
@mattblaze @SteveBellovin It's "the Search for Safety - A History of Railroad Signals and the People Who Made Them"
by the Union Switch & Signal Division, American Standard Inc. 1981
No ISBN number.