There are few substitutes from other industries, if any.
Most of them seem to be obsolete or have one foot out of door.
Digital Camera in the place of Film Camera
Fax machines in place of overnight mail delivery
Products with similar function limit the prices firms can charge
Threat of Substitute Products Threat of New Entrants Threat of New Entrants Bargaining Power of Buyers Bargaining Power of Suppliers Porter’s Five Forces : Model of Competition Rivalry Among Competing Firms in Industry