This is an operator's manual for the Owatonna Imperial Windrowers, a heavy equipment machine manufactured in the United States by Owatanna in the 1960s. The manual provides instructions and guidelines for operating the machine.   ALSO the parts Manual for the Model 81 Self Propelled Windrower published in 60's as well. These item shows that it was used by a person with greasy hands, yet the inside is very nice.  Both for one price.  Will ship promptly.