The certificate of sale is prima facie evidence that:
(a) The parcel was assessed and the assessment duly apportioned as required by law.
(b) The assessment was not paid.
(c) Proper notice of the sale was given and published by the county treasurer.
(d) The sale was had at the time and place specified in the notice or at the time to which the sale was regularly continued.
(e) All steps and proceedings required to be taken by the county treasurer to make a valid sale were taken.
(f) The deed thereafter made by the county treasurer, duly acknowledged, if no redemption is made, shall be prima facie evidence of the same facts as the certificates.
(Added by Stats. 1951, Ch. 336.)