[CR]Curved crank sets...Why

(Example: Racing)

From: Tom Sanders <tsan7759142@sbcglobal.net>
To: <classicrendezvous@bikelist.org>
Date: Fri, 30 Jun 2006 09:32:57 -0400
Thread-Index: AcacSbKduasZ3UD/SyqAIJJETnbyfw==
Subject: [CR]Curved crank sets...Why

On E-Bay this morning there is the strangest thing...a set of highly curved cranks! Item # 320002521795. Might anyone be able to shed some light on the whys and wherefores of them? There is obviously a logic to their design, but it escapes me. How long were these things used? Were they strictly French thing? I see that the seller states that they were marketed in the U.K..
Thanks all,
Tom Sanders
Lansing, Mi USA