From the background information supplied by the inventors, news correspondents obtained the following quote: “Explosion-proof receptacle housings and enclosure systems are used in many different industrial applications. Such explosion-proof receptacle housing and enclosure systems may be used, for example, in military applications, onboard ships, assembly plants, power plants, oil refineries, petrochemical plants, and other harsh environments. At times, the equipment located inside such explosion-proof receptacle housing and enclosure systems is used to control motors and other industrial equipment.
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via Patent Issued for Fastening Devices for Explosion-Proof Enclosures (USPTO 9217460) | Equities.com.