DK38680C
(en )
1928-04-23
Wind wheels in the form of a propeller with several wings arranged one after the other.
FR650805A
(en )
1929-02-11
Air turbine
FR633236A
(en )
1928-01-25
Turbine
FR694009A
(en )
1930-11-27
Clock with rotating wing windmill
FR652153A
(en )
1929-03-05
Impulse turbine with helical sheet
DK41859C
(en )
1930-03-17
Rotor aerostat with several Rotors.
ES109734A1
(en )
1928-11-16
Improvements in the construction of airplanes floats.
ES111205A1
(en )
1929-04-01
Improvements in the assemblies of the propeller and hub of a propeller.
CA274872A
(en )
1927-10-25
Wind turbine
DK38365C
(en )
1928-01-23
Doll with moving features.
FR643779A
(en )
1928-09-22
Three-engined aircraft in axis
ES102354A1
(en )
1927-05-16
Automatic stability improvements in helicopters and helicopters.
DK37366C
(en )
1927-04-19
Mount in the form of a Miniature flagpole or similar.
ES105314A1
(en )
1928-01-01
Improvements in airplanes.
DK42875C
(en )
1930-09-01
Airplane wings.
ES99734A1
(en )
1927-01-01
Improvements in the crane flight variation mechanisms.
DK41923C
(en )
1930-03-31
Wind turbine.
ES107582A1
(en )
1928-07-01
Improvements in indicating devices to orient themselves in the radio-direction.
FR676624A
(en )
1930-02-25
Air thruster with rotating wings
ES120464A1
(en )
1930-12-01
Improvements in the propellers.
DK39138C
(en )
1928-08-20
Wind engine.
DK39601C
(en )
1928-12-10
Wind engine.
DK39171C
(en )
1928-08-27
Wind engine.
ES105211A1
(en )
1928-01-01
Improvement in the economizers.
ES102207A1
(en )
1927-05-16
Improvements provided to the turbines.