Agree with kevin and would like to note that there may be some equipment that is calibrated by a suuplier before you bet it or during set-up. The might include items such as CMM's, granite plates , and gage blocks.
I believe a calibration certificate for them would be acceptable, but don't forget bias, linearity and stability which should be done at your facility to validate the state of the gage to meet your process requirements.
ASD...