key telephone
21Telephone numbers in Iraq — Iraq Area Codes (can be 1 or 2 digits) and the phone numbers are usually 6 digits whereas in Baghdad and some other governorates, the 7 digits. The mobile numbers are 11 digits, beginning with 4 digits codes of each operator and followed by 7… …
22key pulsing — (KP) System of sending telephone calling signals in which digits are transmitted using pushbuttons …
23key·pad — /ˈkiːˌpæd/ noun, pl pads [count] : a set of keys or buttons for entering information into a calculator, telephone, etc. a numeric keypad [=a set of keys or buttons that have numbers on them] …
24Business telephone system — Early model 464G Western Electric key telephone set A business telephone system is any of a range of a multiline telephone systems typically used in business environments, encompassing systems ranging from small key systems to large scale private …
251A2 Key System — The 1A2 Key System is an analog multiline business key telephone system. Unlike more modern multiline systems, every telephone line serving a particular phone is wired into that phone, and electromechanical switches (the keys ) switch the lines… …
26Multi-Line Extension telephone — This article refers to a specific series of historic telephones. For multi line phone systems in general, see private branch exchange or key telephone system. A Multi Line Extension, or MLX telephone, is a no longer manufactured series of digital …
27Hold (telephone) — In telephony, a call may be placed on hold, in which case the connection is not terminated but no verbal communication is possible until the call is removed from hold by the same or another extension on the key telephone system. Music on hold may …
28Model 500 telephone — Western Electric model 500 set made in 1951 By 1975, the Model 500 layout …
29American Telephone & Telegraph — For other companies with similar names, see AT T (disambiguation). Infobox Company company name = AT T Corporation company logo = type = Private (Subsidiary of AT T Inc.) foundation = 1885 location = Bedminster, New Jersey, United States industry …
30Unique key — In relational database design, a unique key can uniquely identify each row in a table, and is closely related to the Superkey concept. A unique key comprises a single column or a set of columns. No two distinct rows in a table can have the same… …
