|
US1973545A
|
|
Wakeless torpedo
|
|
US1874714A
|
|
Variable pitch propeller
|
|
DE549687C
|
|
Testing device for an indicator of cracks in electrical conductors
|
|
US1871476A
|
|
Marine aircraft
|
|
GB335393A
|
|
Improvements in or relating to inspection devices for detecting inaccuracies in the surface of road beds
|
|
GB317070A
|
|
Improvements in or relating to methods of and apparatus for detecting flaws in electrical conductors
|
|
DE666714C
|
|
Slope Meter
|
|
GB309150A
|
|
Improvements in gyroscopic apparatus for defining a vertical reference plane on a moving vehicle
|
|
US1907014A
|
|
Variable pitch propeller
|
|
US1820505A
|
|
Fissure detector for metals
|
|
US1867684A
|
|
Means for preventing the vibration of crank shafts
|
|
US1855929A
|
|
Engine
|
|
US1734353A
|
|
Automatic launching device for airplanes
|
|
GB290073A
|
|
Improved method of and apparatus for detecting flaws or hidden fissures in metal bars, rails and the like
|
|
US1867680A
|
|
Internal combustion engine
|
|
GB284505A
|
|
Improvements in or relating to track recorders
|
|
GB255855A
|
|
Improvements in or relating to power drives for vehicles
|
|
US1771124A
|
|
Engine governor
|
|
US1699379A
|
|
Method of refining crude fuel oil
|
|
US1867700A
|
|
Fuel feed system
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