101,154 to Kagstrom for a “Locking Device for Well Covers and the Like”. That disclosure relates to a device for locking the lid or cover in place on a well casing or the like. That device would be of only limited utility in anything but a pipe casing, since it is designed to op...
The covers non-conductive and non-sparking, has no value of recycling, completely solving the theft problems .The minimum lifespan is 30 years free of maintenance . It can be installed hermetically, and effectively prevent poisonous gases leaking out from ces...