It's also the subject of the Campagnolo Only Trivia
quiz...<http://www.campyonly.com/quizzes/quiz2.html>
>Actually, the device that you are referring to is the Campagnolo
>"Porta Catena". It requires 2 small holes and was introduced in the
>mid to late 70's (?) and proved to be unpopular/worthless. As I
>heard it, Campagnolo sent most of the remaining dropouts that had 2
>holes in the drive side d/o to America...
>
>Here's a webpage I created that shows it...
>
>http://www.velostuf.com/portacatena-sport.htm
>
>John Barron