All About Pocket Knives

Is there a name for this construction feature; when a blade/tool seats into the cover of a folder?

For example: Cheers
-p

Recess maybe. Names for all the tools but I don't believe I've ever seen a name for that particular part of a knife.

Second: Is there a term that distinguishes between the Walker lock and the type of liner lock used previous to his design?
Two very different mechanisms but are commonly referred to by the same name.

-p

As I understand it, "Walker Lock" was used as the name that morphed into the liner lock. Walker being the inventor of the liner lock. Please correct me if I'm incorrect.

Edit: So I'm waaay off base and "linerlock" has been around since forever. Too much minutia for my weak brain. I'm outta here.

"A well made Walker Lock (Liner-Lock), with a proper detent to hold the blade closed and made of decent material, makes a more than adequate pocket knife. With the addition of a pocket clip, introduced by Sal Glesser of Spyderco Knives, the liner-style lock has come to dominate all segments of the market. High, low, and mid priced. Making a strong bid for the high end of that market is it's descendant, the Frame Lock with the same detent. I believe the Frame Lock was first used by maker Chris Reeve."

I think I'll add a clarification to my second question.
Is there a term that applies solely to the type of liner lock used before the Walker lock was invented?
It would help in conversation to distinguish the two.

Wikipedia has a good description of the two mechanisms and their history...
https://en.m.wikipedia.org/wiki/Liner_lock