"The only frame builder I know of who built frames with twin chainstays was a firm called Barkers of Chigwell, Essex UK. I believe I remember the name correctly.
I also believe they patented the concept.
Derek Athey Honiton, Devon UK "
I have a Quad stay racer in the collection, Quad seat stays, unique excentric for chain tensioning at rear axle. If I remember correctly the Pat.Pend. tag is 1898, very light by any steel standard.
David Cowie
Oakland Or.