These are just the companies I know of. TOP 05 MOST COMMON 01. Federal Signal - 32,227 02. Whelen - 10,052 03. ASC - 4,305 04. Fedelcode - 4,052 05. Sentry - 3,134 TOP 10 LEAST COMMON 01. C.A.M. - 004 02. Werden - 015 03. B&M - 018 04. ED Bullard - 019 05. Decot - 026 06. Hormann - 027 07. Scream Master - 053 08. H.O.R. - 087 09. Erick - 102 10. GCS - 111
