I have no idea about your manual, but take a look here the company still appears to be in business, may be worth emailing to see if they have a copy. I hope you find a copy, please let us know how you get on. :^o
Goodness, that brings back good memeories. I bought my first one of these in 1969 when I was living in Tehran. At the time, it had no motor, but sat on the rails of the Emco Rec combi woodworking kit, and was driven off a shaft from the unit's single 3/4 HP motor. Two years later, having sold the combi and moved to Bonn, I bought the stand-alone Emco-Rex B20, and used it until 2003(!) when I sold it for more than I originally paid for it. It never gave me a single problem, and the width of the jointer compensated for the short tables.
The manual went with the machine, but I'd be glad to try to help with any questions.