Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE519944DpriorityCriticalpatent/BE519944A/xx
Application filed by Standard Telephone and Cables PLCfiledCriticalStandard Telephone and Cables PLC
Priority to GB377652Aprioritypatent/GB726906A/en
Publication of GB726906ApublicationCriticalpatent/GB726906A/en
Perfeccionamientos introducidos en un circuito de adapta- cion de linea para uso en un aparato telefonico de abonado con marcacion de numero por pulsadores de tono.
Perfeccionamientos introducidos en una disposicion de cir- cuito para generar tonos de una escala musical para uso en instrumentos musicales electronicos.