4 . C hi c ago P neum at i c r epr es ent s t ool s and c om pr es s o r s t hat ar e engi neer ed f or hi gh per f or m anc e. I n addi t i on t o pi oneer i ng des i gn, hi gh - i m pac t t ec hnol ogy , and dur abi l i t y , C hi c ago P neum at i c m eans c us t om er v al ue. C u st o m er val u e