central-battery dial telephone
21Tip and ring — are common terms in the telephone service industry referring to the two wires or sides of an ordinary telephone line. Tip is the ground side (positive) and Ring is the battery (negative) side of a phone circuit. The ground side is common with the …
22Digital Enhanced Cordless Telecommunications — The base unit and handset of a British Telecom DECT cordless telephone Digital Enhanced Cordless Telecommunications (Digital European Cordless Telecommunications), usually known by the acronym DECT, is a digital communication standard, which is… …
23Telegraphy — (from the Greek words (τηλε) = far and (γραφειν) = write) is the long distance transmission of written messages without physical transport of letters. Radiotelegraphy or wireless telegraphy transmits messages using radio. Telegraphy includes… …
24Royal Observer Corps — Ensign Active 1925–1996 Country …
25Timeline of historic inventions — The timeline of historic inventions is a chronological list of particularly important or significant technological inventions. Note: Dates for inventions are often controversial. Inventions are often invented by several inventors around the same… …
26police — /peuh lees /, n., v., policed, policing. n. 1. Also called police force. an organized civil force for maintaining order, preventing and detecting crime, and enforcing the laws. 2. (used with a pl. v.) members of such a force: Several police are… …
27GSM services — are a standard collection of applications and features available to mobile phone subscribers all over the world. The GSM standards are defined by the 3GPP collaboration and implemented in hardware and software by equipment manufacturers and… …
28Wi-Fi — For the radio station, see WIFI (AM). Wi Fi logo Wi Fi (  / …
29BT Versatility — The BT Versatility is a telephone PBX switchboard sold by BT and targeted at small businesses. It is manufactured by Lake Communications in Ireland as the OfficeLink.It has modular construction allowing a basic setup to be expanded as needed by… …
30Information Processing and Information Systems — ▪ 1995 Sweeping change marked the U.S. computer industry in 1994 as longtime players exited the stage and rival systems struggled to dominate the next generation of personal computer (PC) operating systems and microprocessors. The industry… …
