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A root end surgery, also known as apicoectomy (apico-+ -ectomy), apicectomy (apic-+ -ectomy), retrograde root canal treatment (c.f. orthograde root canal treatment) or root-end filling, is an endodontic surgical procedure whereby a tooth's root tip is removed and a root end cavity is prepared and filled with a biocompatible material.
Lemon Yellow (The AAR's official name) - Used in position light systems as an all-purpose high visibility color, greatest fog penetration. (Plain) White - Plain incandescent white light. Used in dwarf position light signals with frosted lenses. Individual signal heads may be set to flash a color to create a different signal aspect.
The AB Standard was a New York City Subway car class built by the American Car and Foundry Company and Pressed Steel Car Company between 1914 and 1924. It ran under the operation of the Brooklyn Rapid Transit Company (BRT) and its successors, which included the Brooklyn–Manhattan Transit Corporation (BMT), the New York City Board of Transportation, and the New York City Transit Authority ...
What are now New Jersey Transit's Morris & Essex Lines (the Morristown Line and Gladstone Branch) and Montclair-Boonton Line were electrified by the Delaware, Lackawanna and Western Railroad at 3000 V DC in 1930/31. [25] By August 1984 the lines had all been converted to 25 kV 60 Hz by NJ Transit. [26]
The plus sign (+) and the minus sign (−) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition , which results in a sum , while − represents subtraction , resulting in a difference . [ 1 ]
ARC-Authentication-Results (abbreviated AAR) - A combination of an instance number (i) and the results of the SPF, DKIM, and DMARC validation ARC-Seal (abbreviated AS ) - A combination of an instance number (i), a DKIM-like signature of the previous ARC-Seal headers, and the validity of the prior ARC entries.
The primary exception to this situation is in the field of heavy rapid transit, such as subways and elevated lines, which make use of a localization of the British practice, or a combination of the AAR and British systems. Some freight railroads also still use route signalling.
The 9 Broadway–Seventh Avenue Local [1] was a rapid transit service in the A Division of the New York City Subway.Its route emblem, or "bullet", was colored red, since it used the Interborough Rapid Transit Company (IRT)'s Broadway–Seventh Avenue Line for its entire route.