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Tech Products Inc. has been manufacturing signs, tags and labels since 1948. The company says it has a full line of stock signs for railroad, construction and telecommunication use, and can customize signs for every need. Products include crossbucks, mile markers, accident prevention signs and whistle signs. The signs are designed to meet the DOT, MUTCD and/or OSHA standards. By using its patented Everlast® system, the company says it produces durable products for use in the worst environments, adding that it guarantees a sign to be readable for 40 years in any weather pattern.