MDR — Manufacturing Data Report
The documentation package delivered with manufactured equipment, often used interchangeably with MRB and sometimes covering a wider scope including design documents.
In practice the scope is set by the contract rather than by the acronym. Some clients use MDR for the whole turnover package including design, operating and spare parts documentation; others use it exactly as they would use MRB.
Read the required contents list. It is the only definition that binds.