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Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme. Special quality variants may have the letter "S" appended, or the device description letters may be swapped with the numerals (e.g. an E82CC is a special quality version of an ECC82)
Pressure can be achieved by simple materials (e.g. regular steel) and positive displacement vacuum pumps; viscous flow regime for gases <100 Pa to 0.1 Pa medium (fine) vacuum Pressure can be achieved by elaborate materials (e.g. stainless steel) and positive displacement vacuum pumps; transitional flow regime for gases <0.1 Pa to 1 × 10 −6 Pa
Purchased new. Sold in 2005. Resold to Edwards Railcar Co. in 2007. 278 1st Lake Fairweather: Coast Steel Fabricators, Ltd. 1969 Purchased new. Sold in 2005. Resold to Georgetown Loop Railroad in 2007 (GL #228). Renamed Silver Queen by Georgetown Loop Railroad. 280 1st Lake Dease: Coast Steel Fabricators, Ltd. 1969 Purchased new. Shipped out in ...
Each pulse causes the targeted chamber(s) to contract and pump blood, [3] thus regulating the function of the electrical conduction system of the heart. The primary purpose of a pacemaker is to maintain an even heart rate , either because the heart's natural cardiac pacemaker provides an inadequate or irregular heartbeat, or because there is a ...