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Electronic Music Studios
http://www.ems-synthi.demon.co.uk/
Original EMS synths still in production and new models.
Music Machines: EMS
http://machines.hyperreal.org/manufacturers/EMS/
Overview from 1969-1979. Information, images, and schematics.
Old Tech Synth Site - EMS Synthi-E
http://www.oldtech.com/synth/EMSSynthiE.html
Image and data sheet.