GB317149A
(en )
1929-08-15
Improvements in or relating to electro-magnetic devices
AU1739528A
(en )
1929-12-24
Improvements in or relating to piezoelectric devices
AU1239028A
(en )
1928-09-25
Improvements in or relating to piezoelectric devices
AU1767929A
(en )
1930-01-14
Improvements in or relating to acoustic devices
AU1293528A
(en )
1928-11-07
Improvements in or relating to advertising devices
AU1577728A
(en )
1929-10-01
Improvements in or relating to electric devices
AU1211128A
(en )
1928-10-02
Improvements in or relating to adjustable box-spanners
AU1175028A
(en )
1928-12-31
Improvements in or relating to telephone systesis
AU1217028A
(en )
1928-10-30
Improvements in and relating to penny-inthe-slot devices
AU1719328A
(en )
1929-07-16
Improvements in or relating to vices
AU1460828A
(en )
1929-08-06
Improvements in or relating to ticket-punching apparatus
AU1596028A
(en )
1929-07-02
Improvements in or relating to grit-spreading apparatus
AU2311029A
(en )
1930-06-03
Improvements in or relating to time period devices
AU1899729A
(en )
1930-04-01
Improvements in or relating to acoustic devices
AU1038227A
(en )
1928-11-13
Improvements in or relating to interleaving devices
AU1535828A
(en )
1929-03-19
Improvements in or relating to acoustic instruments
AU782627A
(en )
1928-07-03
Improvements in or relating to electromagnetic devices
AU1676928A
(en )
1929-06-18
Improvements in or relating to conveyors
AU827927A
(en )
1927-11-02
Improvements in or relating to telephony
AU1148428A
(en )
1928-07-17
aimprovemnents in or relating to cigarette container-s
AU2222229A
(en )
1930-05-20
Improvements in or relating to totalizators
AU1570328A
(en )
1929-10-01
Improvements in or relating to sound-projectors
AU2243629A
(en )
1930-03-18
Improvements in or relating to drill-steels
AU1950229A
(en )
1929-10-01
Improvements in or relating to microphons
AU1910729A
(en )
1929-09-10
Improvements in or relating to microphones