Clean On board Bill of Lading Vs. Shipped On board Bill of Lading

One of the readers of this web blog requested recently to explain the term Clean On Board Bill of Lading and Shipped on board Bill of Lading.

This is one of the common doubts among the traders to differentiate Shipped on Board Bill of Lading and Clean On Board Bill of Lading.  Are shipped on board bill of lading and clean on board bill of Lading same? If different, what are the difference between Clean On Board Bill of Lading and Shipped On Board Bill of Lading?

Source: Internet