Cynthia Bridges, Sec., Dept. of Rev., State of Louisiana v. Nelson Industrial Steam Co. C/W Nelson Industrial Steam Co. v. Calcasieu Parish School System Sales and Use Tax Dept. C/W Cynthia Bridges, Sec., Dept. of Rev., State of Louisiana v. Nelson Industrial Steam Co. C/W Nelson Industrial Steam Co. v. Calcasieu Parish School System Sales and Use Tax Dept.