#I choose to believe that Watson and Stamford invented the tandem bike but did not bother to patent it

[ineffabletwaddle13]

Stamford and Watson go for a ride on a tandem bicycle and talk about Holmes

(Tandems were first available from 1889, with patents for similar ideas from a few years earlier. Assuming Holmes and Watson met in 1881 in this series, like they are supposed to have in the books, then how is there a tandem already?)