Trillingsmeetapparaten / Philips' gloeilampenfabrieken, afd. industriele meet- en regelapparaten UHF tubes communication and measuring equipment : technical documentation of Philips U.H.F. tubes DC 80 - EC 80 - EC 81 - EC 55 / … Products in picture / Philips Telecommunication Industries/Philips Telecommunicatie Industrie Concise description of transmitting receiving equipment : description sommaire de l'installation d'Emission-Réception, type SRR 230/00 / Philips Telecommunicatie Industrie Regeltransformatoren / Philips Nederland Automatic potentiometers for measuring, controlling and recording in industry and laboratories / Philips Provisional description of transmitting and receiving equipment, type SRR 297/00 : provisional description of SRO 297/00 receiver / Philips Telecommunicatie Industrie N.V.