Vanished Tool Makers: Master Tools, U.S.A.

I've got this very thin, nicely made wrench marked "Master Tools --Alloy-- M 1731 A."  Also, a heavier one marked "M-1725B":

Plus a sliding T-handle 3/8"-drive socket wrench marked "Master M7J Made in USA":

And two sockets.  One 1/2" socket, marked "Master MR 22" with a hole pierced on one side for holding and releasing the ball detent on the ratchet:

One 1/2"-drive 13/16" deep socket marked LMR2:

I can find nothing on the company that made them.