property lawyer, the couple filed an application for the girder and panel trademark and set up their business, bridgestreet toys, out of their suburban boston home. >> as soon as you apply for the trademark, you're entitled to use the tm. once you go through the entire process and it's done you use the little r with the circle called registered. that means it's now complete. >> with the old kenner designs long gone, paul was in charge of producing the new sets from scratch. >> reverse engineer them and look at the literature and what could be built with it and what parts should we do first. >> bridgestreet toys have carved out a niche in the toy industry based on their brand name. but they are quickly winning over a new generation of architects and engineer who is love the retro product all over again. >> i love the hydrodam. there is so much you can do. and it's water, you know.