FR650448A
(en )
1929-01-09
Improvements to electro-therapeutic devices
FR666922A
(en )
1929-10-08
Improvements to hearing devices
FR650893A
(en )
1929-02-12
Improvements to baby bottles and other similar devices
FR666169A
(en )
1929-09-27
Improvements to electrical contactors and similar devices
BE356537A
(en )
1929-01-31
Improvements to totalizing and similar devices
FR645452A
(en )
1928-10-26
Improvements to telephone devices
FR658706A
(en )
1929-06-19
Improvements to wetting devices
FR658222A
(en )
1929-06-01
Improvements to boilers and similar devices
FR657859A
(en )
1929-05-28
Improvements to pump-turbines and other similar devices
FR606056A
(en )
1926-06-07
Improvements to mixers and similar devices
FR643016A
(en )
1928-09-08
Improvements to galvano-cauteries and analogues
FR696555A
(en )
1931-01-05
Improvements to economizers and similar devices
FR618593A
(en )
1927-03-11
Improvements to fans and similar devices
FR684050A
(en )
1930-06-20
Improvements to fans and similar devices
FR655142A
(en )
1929-04-15
Improvements to rotary pumps and similar devices
FR643277A
(en )
1928-09-13
Improvements to projection devices
FR683341A
(en )
1930-06-11
Improvements to odometers and similar recording devices
FR660845A
(en )
1929-07-17
Improvements to mixing devices
FR647748A
(en )
1928-11-30
Improvements to cinematographic devices
FR642986A
(en )
1928-09-07
Improvements to cinematographic devices
FR33497E
(en )
1928-09-28
Improvements to cinematographic devices
FR655666A
(en )
1929-04-22
Improvements to loudspeakers and analog devices
FR647106A
(en )
1928-11-20
Improvements to gyrostatic devices
FR631015A
(en )
1927-12-13
Improvements to pendulum lens devices and similar devices
FR660445A
(en )
1929-07-11
Improvements to cystoscopes or similar devices