On the subject of CONTENTS
The pliers in Don's and my sets - and the "R.T.E.C." stamped electrical wrenches in my set, bring up the question of what contents constitute a complete R.T.E.C. set, a subject some of the other threads have touched on briefly, that we should probably re-visit here on the dedicated thread.
We have no R.T.E.C. catalog (and I wouldn't expect one, as there is no evidence of commercial sales).
The best source would be a Signal Corps manual, but I can't find an exact match for this electrical kit, although there is something similar in set TE-41. More on that below.
The big question is whether the sets R.T.E.C. was providing to the Signal Corps came in different configurations (i.e., a set with sockets, a spinner and a sliding T, without pliers and wrenches), or whether there was only one large combination set (like the kinds Williams and a few other mfgrs made) with sockets, a spinner, a sliding T, and pliers and electrical wrenches.
If the "7016" on the R.T.E.C. labels is a set number (which I always assumed), and we've only ever seen that one set number on an R.T.E.C. label, I'm assuming it's the latter.
Note that the "R.T.E.C." marked sockets are very consistent in terms of service opening sizes and broachings across four.cycle's and Unaiu's sets.
The sockets in my set (see Thumbnails #1 and #2), all caked in the same dry cosmo as the wrenches, and almost certainly original to each other and the set, are also consistent with four.cycle's and Unaiu's in terms of service opening sizes. One minor distinction is they're all 6-point sockets except for the 3/8", which is a 12-point socket. (That difference could be a function of different OEMs, not of a different set specification.) I have not compared the socket configurations to any of the other partial R.T.E.C. sets we know of, and I'm not sure we have that info from those guys.
My set:
Walden-Worcester 3106 - 6-pt 3/16"
Walden-Worcester 3017 - 6-pt 7/32"
Craftsman BE (this would be the WW 3108!) - 6-pt 1/4"
Walden-Worcester 3109 - 6-pt 9/32"
Walden-Worcester 3110 - 6-pt 5/16"
Walden-Worcester 3111 - 6-pt 11/32"
Walden-Worcester 3112 - 12-pt 3/8"
(Missing 7/16")
Back on the electrical wrenches (see Thumbnail #3) - note that they are miniature engineers' configuration, not classic 15* x 60* or 15* x 75* ignition configurations. Note also that I have been watching for "R.T.E.C." stamped wrenches for over a year now and I have never seen or found any other than these four (4) size combinations. I'm not ready to say it's definitive, but it sure looks like these are the only four (4) wrenches that went in the kit.
5/16" x 3/8"
9/32" x 11/32"
15/64" x 1/4"
13/64" x 7/32"
Finally, note that these precise four (4) wrenches, these precise eight (8) sockets, a spinner, a sliding T, and ignition pliers are the precise contents of a 15-piece Williams Electrical Set 1285P. (See Thumbnail #4)
I'm not saying Williams was the/an OEM for the "R.T.E.C." stamped electrical wrenches and pliers (although it is a possibility). I am saying it sure looks like R.T.E.C. and/or the Signal Corps modeled the R.T.E.C. 7016 set after the 15-pc Williams 1285P set.
That is not surprising. J.H. Williams definitively supplied a midget wrench set to the Signal Corps for Tool Equipment (TE) set TE-41. They are listed as the supplier in the manual. Signal Corps stock number 6R 55503. The figure of the wrench set in the manual has more wrenches, looking like a set somewhere in between the 15-pc Williams 1285P and the 20-pc Williams 1291P in terms of contents. But Wrench Set 6R 55503 is not specified in detail by piece parts in that manual, so it's possible the Signal Corps did not order it by piece part specs, but at the set level, and weren't too particular about the piece parts. And it's possible that they turned to R.T.E.C. as a secondary source for the kits, who in turn bought piece parts from Walden, Craftsman, and other OEMs to put additional wrench sets together for TE-41 fieldings.