Denver. Sign code City council votes down billboard move. Post Ag 2, 1973 p,30 U.S. 10th Circuit Court of Appeals overturned the District Court decision declaring the city sign code unconsti- tutional and declared it a reasonable use of police po- wer, Post N 30, 19 p.21 RMN N 30, 1973 p.8 Court decision upholds sign code; poses threat to non- conforming strüctur^s. Post ß 9, 1973 p.72