13 . R eso u r ces I nf orm a t i on on C hi c a go P ne um a t i c F or in f o rm at io n on C hic a go Pneu m a t ic , g o t o: w w w .cp .co m I nf orm a t i on on t he A t l a s C opc o Group C h ic ag o Pne um at ic is a part of t he At la s C op c o Grou p. F or in f o rm at io n on At las C op c o, go t o w w w . at la s c o pc o . c o m