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SelTrac is a digital railway signalling technology used to automatically control the movements of rail vehicles.It was the first fully automatic moving-block signalling system to be commercially implemented.
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In the early 1980s, SEL introduced a system based on emitter-coupled logic (ECL) technology code named the Thunderbird. Its official marketing name became the Concept series, consisting of three models: the low-end Concept 32/67, [13] and the refrigerator-sized Concept 32/87 [14] and 32/97.
The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams. 207 Multi-Status (WebDAV; RFC 4918) The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.
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He sold his first product, the SEL-21, to Otter Tail Power Company in Fergus Falls, Minnesota in 1984. Otter Tail initially used the SEL-21 for its fault location and event recording functions. In 1985, SEL built its first building and employed eleven people. In 2009, SEL became 100% employee-owned under an employee stock ownership plan (ESOP).
LeBron James is still doing things he's never done, at the age of 39.. On Friday, the Los Angeles Lakers superstar recorded a fourth straight triple-double for the first time of his career ...
The early CPU lacked dedicated control registers, and relied on a limited set of internal signals and flags. [1] When IBM developed a paging version [note 1] of the System/360, they added 16 control registers [2] [3] to the design for what became the 360/67.