GB247619A
(it )
1900-01-01
US1432553A
(en )
1922-10-17
Production of color music and other luminous effects and apparatus therefor
US769203A
(en )
1904-09-06
Electric signal.
US1434727A
(en )
1922-11-07
System of electric lighting
US1401608A
(en )
1921-12-27
Illum nating attachment for keyboard musical instruments
US2019075A
(en )
1935-10-29
Bell ringing circuit and switch therefor
GB191505768A
(en )
1916-02-03
Improvements in Electric Lighting.
GB288090A
(en )
1928-04-05
Improvements in electric imitation coal fires
GB252229A
(en )
1926-05-12
Improvements in or relating to electric alarm systems
GB191120794A
(en )
1912-09-05
Improvements connected with Series Electrical Lighting.
GB360595A
(en )
1931-11-12
Improvements in or relating to electric signalling systems
ES2071557B1
(es )
1997-12-01
Un sistema para la reduccion de consumo de energia electrica en redes de alumbrado, publico y privado.
GB190804066A
(en )
1909-01-07
Improvements in connection with Series-parallel Electric-lighting Circuits.
US2761980A
(en )
1956-09-04
Impedance apparatus for producing rapid irregular changes in current flow
US521924A
(en )
1894-06-26
wright
ES8104884A1
(es )
1981-04-16
Cuadro de mando para una instalacion de alumbrado electrico
SU145123A1
(ru )
1961-11-30
Устройство дл октавного удвоени мелодии
US689711A
(en )
1901-12-24
Electric visual-signal apparatus.
GB190117363A
(en )
1902-08-28
A Luminous Press-button for Electric Bells for Indicating When the Attendant is Coming.
GB190925288A
(en )
1910-09-01
Improvements in connection with Installations of Electric Incandescent Lamps Connected in Series.
GB428399A
(en )
1935-05-13
Improvements in or relating to electrical control systems for illumination apparatusassociated with musical instruments and producing spectacular effects
GB346460A
(en )
1931-04-16
Improvements in the electric illumination of pianos
GB855937A
(en )
1960-12-14
Improvements in or relating to circuit arrangements for operating electric lamps
GB190526149A
(en )
1906-04-05
An Improved System of Electrical Distribution
GB190004926A
(en )
1901-03-02
Improvements in Automatic Time Switches.