Covering for an access aperture, and related assemblies
Covering for an opening with a cover or grating placed in a fram
Device for a pavement manhole with a support frame for...
Device for covering shafts
Device for raising level of manhole cover
Device permitting a plug or a cover to lock in a detachable...
Double pivot semi-automatic manhole cover lifting device
Dual lifting manhole cover
Emergency maintenance hole cover, and method of installation
Enclosement to shield structure which secures entrance-deterring
Entrance-deterring cap for manhole openings
Excavation closure
Extension for a canal bed liner
External manhole chimney seal
Flush mount well protector
Frame for a covering for an opening protected by a cover or grat
Gripping device for retaining a ring member supporting a manhole
Height adjustment ring for manhole cover frame
Height and angle adjustable utility access device and method
High security manhole insert cover