FR698774A
(en )
1931-02-05
Alarm device
FR689677A
(en )
1930-09-10
Device for ozone production
FR715476A
(en )
1931-12-03
Device for the production of ozone
CH145437A
(en )
1931-02-28
Device for the production of ozone.
FR699062A
(en )
1931-02-10
Device for ozone production
FR701618A
(en )
1931-03-20
Sealing device
FR673550A
(en )
1930-01-16
Coupling device
SU23690A1
(en )
1931-10-31
Method of making antiseptics
CH139110A
(en )
1930-04-15
Nursery for the feeding of cattle.
FR627931A
(en )
1927-10-15
Device for the orientation of the projectors
FR722234A
(en )
1932-03-14
Device for producing electric oscillations, using neon lamps or the like
FR686735A
(en )
1930-07-30
Device for fitting ampoules
FR688894A
(en )
1930-08-29
Device for the suspension of shoes
FR626403A
(en )
1927-09-06
Device for the production of electric oscillations
FR684534A
(en )
1930-06-26
Device for the production of split rings
FR690598A
(en )
1930-09-23
Wiper device
FR685914A
(en )
1930-07-18
Device for the production of x-rays
FR687288A
(en )
1930-08-06
Rolling device for the production of blanks for twist drills
FR676437A
(en )
1930-02-22
Stapling device for conical keys
FR682551A
(en )
1930-05-30
Lock nut device
ES113215A1
(en )
1929-07-16
Aerogeodeic device called "stereo-reflector".
FR731886A
(en )
1932-09-09
Device for the production of electric waves, in particular for the production of ozone
FR683016A
(en )
1930-06-05
Device for the production of animated photographs
CH160192A
(en )
1933-02-28
Apparatus for teaching music.
FR701317A
(en )
1931-03-14
Device for the production of short waves