[Boatanchors] Name that connector!

[F W Mooney]

I have a vintage 1944 MIL-SPEC boatanchor, a National RBL-6, which has =
two unusual connectors on the back.  Can anyone identify them and/or =
name a source to obtain the mating connectors?

The first one is a huge coaxial cable connector for 50 ohm coax:  =
http://home.sprintmail.com/~fmooney/RBL6/p104.jpg

The second one is a three wire AC line cord connector.  The shaft in the =
middle is ground, with hot and neutral being rounded tabs on either side =
of the ground shaft (the brass nuts in the picture are fasteners, not =
connectors):  http://home.sprintmail.com/~fmooney/RBL6/j102.jpg

Thanks.

- Fred M.  KA1DGL