Rogers helps Bob Trow inflate one tire of a tandem bicycle. Homer purchases a dumbbell while Marge gets a tandem bicycle. On their 25th wedding anniversary, the Swensons received a tandem bicycle. He was also co-designer of the first ever tandem bicycle. The 280 sealed machines included ten tricycles, two Tandem bicycle, and one Penny-farthing. Developments include a collapsible delivery bicycle in 1930 and a tandem bicycle introduced in 1935. In the photographs, the two rode a tandem bicycle, with Tripp pedaling and Bowen steering. In the '80s or '90s, an eight-seat tandem bicycle was built and demonstrated in Philadelphia.