Hydraulic door control system
Hydraulic door hinge
Hydraulic door operator with overtravel restraint
Hydraulic hinge
Hydraulic hinge with door closing mechanism
Lightly-operating automatic door closer with double cylinders
Liquid check and closer
Method for shape and timing equivalent dimension extraction
Method of swinging a pivoted door to a selected position and cam
Multiple position ball stud for closure strut
Offset pivot hinges with door closing devices
One-way hinge damper
Opening and closing damping apparatus
Operator for sliding doors
Overhead concealed door closer, mechanically, hydraulically oper
Piston assembly for door closer
Piston-tpye door closer with adjustable closing speeds
Piston-type door closer with adjustable closing speeds
Pivot hinge with removable door closing device
Return apparatus