Paul, I believe it is obsolete. The giveaway is the 'silver' prong, which is by standard conventions a "neutral", with the other two as phase 1 and phase 2 of a 240 single phase circuit. NEC has specified that ALL 120 or higher circuits need a ground (a non-current carrying conductor), and the blade of a plug or receptacle marked as "neutral" is not acceptable as ground, even if hooked up that way. You'll notice that all grounded twist-lock plugs have a brass 'L' blade, that is a bit longer than any of the rest, and THAT is the ground. In a 240 4 wire circuit, the neutral will be 'silver', and no longer than the phase blades.
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