[QUOTE=Kommisar89;9668234]
BTW, the 1952 French Peugeot catalog shows a PH55 "mixte" frame however it is simply refered to as a "Model Dame" or Lady's Model with "cadre triangule ou berceau" - Batman, little help here with the translation?

Triangulé is triangulated as you mention, cadre berceau is cradle frame. Which means nothing, because except monocoque, cradle frames are all frames, excepting oddities like the Dursley Pedersen, and even then it might be arguable that that particular design is just a variant on the cradle frame.

On the subject of the DP bike, is that age old argument about whether the thing is stressed or not still going on ? If so, here's an easy way to find out : use hi res digital camcorder at about 100 frames a second, take hacksaw to bicycle, and examine on film which direction, amplitude and speed the tube moved.

Anyway, cadre triangulé ou berceau was just a fancy tech type marketting term for impressing a unaware public, and furthermore, a mixte is a lady bike. Irrespective of whether it is equipped with drops or flat bars. Sorry to offend, but that is a undisputable historical fact