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
Application filed by Davydov Boris KfiledCriticalDavydov Boris K
Priority to SU762367545ApriorityCriticalpatent/SU603141A1/en
Application grantedgrantedCritical
Publication of SU603141A1publicationCriticalpatent/SU603141A1/en
1. Давыдовский В. М. Телефонные аппараты и станции ручного обслуживани . М., Трансжелдориздат , 1957, с. 22-23.1. V. Davydovsky. Telephone sets and stations of manual service. M., Transzheldorizdat, 1957, p. 22-23.w///////////;iw ///////////; i
SU762367545A1976-05-241976-05-24Telephone communication device
SU603141A1
(en)