Buffet And Hutch

I have a sideboard / hutch that opens to a full size table. He has six wooden folding chairs in the deep walnut doors decorated. It is easy to convert from a buffet next to a dining table. What's it called and how do I research its value.

I've seen before .... I do not know what they are called, but I think something like her ..... stowaway buffet or sometimes they are called a drop-leaf table .......