Golrmar - Spanish manufacturer and exporter of audio and video door entry systems, intercoms, monitors, and door releases. Grupa Techniczna CODI - Manufacturer of digital door phones, video door phones, and intercoms. Poland. Aiphone Corporation - Manufacturer of intercom solutions for communication and security, providing a wide variety of audio and video systems, specializing access entry and control systems in the world. Alpha Intercom - Offers intercoms, video-intercoms, access controls, door strikes, and nurse call systems. Based in Canada. Housing Devices Inc. - Manufacturer of vandalproof building entry intercoms, apartment audio/video intercoms and emergency call systems. Lee Dan Communications, Inc. - Provides an online catalog of offered intercoms and postal products. Videx Door Entry and Access Control - Designs and manufactures audio and video security entry systems, door entry intercoms and access control systems. Thodukonics - Provides wireless, household, domestic, wall, line and grid and AC power intercom. Bitron Video Door Entry Systems - Audio & video telephone door entry systems and access control solutions. Manufactured in Europe, distributed worldwide, local support.