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@systemBuilder
Guys,
there is a company in America that is making a nice reproduction of the 1970's 144 bcd campagnolo-type chainrings, I think it's called "Rocket Rings", and their rings have an inner spider, as requested. They offer 44T-53T in 1/8th pitch, and 42/52T in 3/32 pitch. You can get them on ebay from a shop in wisconsin called wheel and sprocket, here is a search in their ebay store :
http://stores.shop.ebay.com/wheelandsprocket__W0QQ_sidZ164232633?_nkw=144+campy&submit=Search
Note that the rings are T6061, so they are not quite as sturdy as TA rings, but if you have a vintage road or track bike, you might like a chainring that looks period correct for your bike. It's nice to have a renewable supply of these chainrings.