Upon the assessment roll must be placed after the name of each company a general description of the operating property of the company, which is considered sufficient if described in the language of RCW
84.12.200(8), as applied to the company, following which must be entered the true and fair value of the operating property as determined by the department of revenue. No assessment may be invalidated by reason of a mistake in the name of the company assessed, or the omission of the name of the owner or by the entry as owner of a name other than that of the true owner. When the department of revenue has prepared the assessment roll and entered thereon the true and fair value of the operating property of the company, as herein required, the department must notify the company by mail of the valuation determined by it and entered upon the roll.