FSS - Federal Signal Corp (FSS) Q1 2021 Earnings Call Transcript May, 05 2021 05:30 PM Federal Signal Corporation Image source: The Motley Fool. Federal Signal Corp (NYSE: FSS) Q1 2021 Earnings Call May 5, 2021 , 10:00 p.m. ET Operator Continue reading For further details see: Federal Signal Corp (FSS) Q1 2021 Earnings Call Transcript