Hearing aid for improving perception of acoustic waves, comprises two shell-like reflectors connected with one another by retaining bracket, where reflectors have half shell with concave curvature, similar to parabola, in cross section
GB623401A
Improvements in and relating to hydraulic presses
GB626047A
Extrusion press
GB568834A
Shaft straightening press
GB566460A
Hydraulic system
GB568016A
Relief valve
GB577836A
Improvements in and relating to relief valves
GB563672A
Improvements in and relating to relief valves
GB561377A
Improvements in or relating to valves
GB564190A
Improvements in or relating to control valves for hydraulic systems for hydraulic presses
GB565338A
Improvements in or relating to hydraulic presses
GB555460A
Improvements in or relating to hydraulic pumps
GB549950A
Improvements in or relating to hydraulic systems
GB540158A
Improvements in rotary pumps or motors
GB540166A
Improvements in or relating to hydraulic machinery
GB540242A
Improved valve for hydraulic circuits
GB535625A
Improvements in or relating to hydraulic machinery
GB540207A
Improvements in or relating to hydraulic machinery
GB535898A
Improvements in or relating to hydraulic presses
GB526782A
Improvements in or relating to rotary radial hydraulic pumps or motors
