General Traffic Controls, Inc.

P.O. Box 1000

2915 11th Ave. SW

Spencer, IA 51301

Tel: 1 712 262-1521

Fax: 1 712 262-1714

Never-Fail Loop Systems

7911 NE 33rd Drive, Unit 160

Portland, OR 97211 USA

Tel: 1 503 408-9248

Fax: 1 503 408-1032