[Milsurplus] Wanted, plug-in gadget that powers AC outlet when current drawn by other load

[WA5CAB at cs.com]

This isn't particularly either on or off topic.  What I currently want it 
for is to start my dust collector (shop vac) when I turn on my Shopsmith 
table saw.  But it could have other uses.  The dust collector attached to my 
bead blast cabinet (BA content - used mainly on mil radio shock mount refurb) 
has an accessory outlet (and a mode switch to enable or disable the function) 
that I plug one of the cabinet lamps into.  When I turn on the lamp to use 
the cabinet, it auto starts the dust collector (which is located behind the 
cabinet and about a 15 foot round trip walk to reach).  I'm looking for a 
commercially available gadget that I can plug into any 120 volt AC outlet.  It 
would have two (or possibly more) outlets on it.  One I would plug a load 
into that would be controlled by its on ON-OFF switch.  Into the second I 
would plug a load that would come on when the first load was turned on and drew 
current through the adaptor gadget.  And turn off a few seconds after the 
locally controlled load was turned off.  I could build one but I already have 
enough projects that I haven't had time to get to, so would prefer to buy 
one if anyone knows where one could be bought.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480