It dates back to 1993/1994 which was the point at which Lefax became part of the Filofax Group.
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I wonder how the double ring one, Charterhouse, worked. How where the two sets orientated when closed?
ReplyDeleteThere's an example here:
Deletehttps://philofaxy.blogspot.com/2016/06/guest-post-lefax-duplex-by-gmax.html
Ah, I see. That’s a rather clever design! I cant imagine carrying one around though.
DeleteBut having the rings at the same position takes up lots of space. In the given example, it even takes more space than two binders.
DeleteThe space saving alternative is to have the rings at opposite sides, and let the two stacks of paper overlap. However, this takes up more witdh.
The 'sigma duplex', as made by Mulberry, avoids that space problem. But you can't use both binders at the same time...
Deletehttps://thisbugslife.com/2016/02/09/mulberry-double-binder-in-black/
Steve looked at the various duplex options a while back...
https://philofaxy.blogspot.com/2016/01/design-your-own-organiser-how-difficult.html
I've been playing with sigma duplex binders, starting with some cheap Amazon pocket ring mechanisms and a cereal packet, to a couple of tatty old Domino Pockets, and most recently, a couple of new (but very cheap) Domino Pockets. My application is field manuals, with one half for 'instruction' and the other half for 'operation'.
It just depends on how you'd fold the covers.
DeleteJust imagine two opened binders next to each other, joining them at the edges where they touch. Then Z-Fold the long part between the rings to make the paper stacks overlap. Leaving something like O====O. Then the outer parts would overlap at the top, where you could close them with push-buttons.