1. The assessor or the county clerk shall return the manufacturers’ tax book and the assessor shall make the reports required by section 150.325 to the county board of equalization on or before the second Monday of July of each year. For the purpose of equalizing the valuation of manufacturers’ statements, the county board of equalization shall carefully compare the statements made by such manufacturers with the reports made by the assessor under section 150.325, and shall have the same powers and shall proceed in the same manner as is provided by law for the equalization of real and tangible personal property so far as is consistent with sections 150.300 to 150.370.

2. After the board has raised the valuation of any statement, it shall give notice of the fact to the manufacturer whose statement has been raised, by personal notice through the mail, specifying the amount of such raise, and that the board will meet on the second Monday in August to hear reasons, if any, why such increase should not be made.

3. The sum of the valuation of the statements as equalized by the county board of equalization shall be included in and made part of the total valuation of property taxable for all purposes.