I have a White Model 645 Sewing Machine, need owner manual?

I have a White Model 645 Sewing Machine, I need an owner's manual as one did not come with this used machine. I have searched and searched on the internet to no avail. I cannot find one to download or a printed one. This machine can be a portable one or can be permanently placed in a sewing machine cabinet. I thing the machine is about 30 or 40 years old and in good condition. If anyone has this model #645 White Sewing Machine and you have your manual, I would very much appreciate you posting the address for the White Company, whereby I can order a manual from them. I cannot find a company address. Have they been bought out by another company? Are they located in America? This machine was given to me and I know nothing about the company.
Thank you very much for assistance, Milly Luker