Brass Tag Collection Oil No. 101Brass Tag Collection Oil No. 101 The C&P Brass Tag Jewelry Collection features vintage brass tags sourced from a hydraulics plant in Paducah, Kentucky. The tags were used for the company's "lockout tagout" practice a safety practice aimed at preventing injuries that could be caused by an unexpected startup of a piece of machinery or equipment undergoing maintenance. The tags were used to notify other employees that the device should remain in the safe