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2. Circulator pump - Wikipedia

   en.wikipedia.org/wiki/Circulator_pump

   This avoids one of the principal challenges faced by the larger, two-part pumps: maintaining a water-tight seal at the point where the pump drive shaft enters the pump body. Small- to medium-sized circulator pumps are usually supported entirely by the pipe flanges that join them to the rest of the hydronic plumbing. Large pumps are usually pad ...

3. Armstrong Tools - Wikipedia

   en.wikipedia.org/wiki/Armstrong_Tools

   Armstrong Tools was an American industrial hand tool manufacturer. [1] In its final years, it existed as a brand of Apex Tool Group , LLC and manufactured the majority of its tools in the United States, focusing mostly on aerospace, government, and military users.

4. Piping and instrumentation diagram - Wikipedia

   en.wikipedia.org/wiki/Piping_and_instrumentation...

   Piping and instrumentation diagram of pump with storage tank. Symbols according to EN ISO 10628 and EN 62424. A more complex example of a P&ID. A piping and instrumentation diagram (P&ID) is defined as follows: A diagram which shows the interconnection of process equipment and the instrumentation used to control the process.

5. Armstrong oscillator - Wikipedia

   en.wikipedia.org/wiki/Armstrong_oscillator

   The Armstrong oscillator [1] (also known as the Meissner oscillator [2]) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation. The Meissner patent from 1913 describes a device for generating electrical vibrations, a radio transmitter used for on–off keying .

6. A Sleep Expert Warns Against "Unhealthy" Sleep Trend - AOL

   www.aol.com/sleep-expert-warns-against-unhealthy...

   More and more people are talking about polyphasic sleep patterns. But a sleep doctor explains why polyphasic sleep is so unhealthy for humans.

7. Armstrong - Wikipedia

   en.wikipedia.org/wiki/Armstrong

   Armstrong Group of Companies, a conglomerate begun in Armstrong County, Pennsylvania; Armstrong Telephone Company, a telecommunications provider serving as a local exchange carrier in rural market; Armstrong Tools, an industrial hand tool manufacturer; Armstrong Whitworth, the British engineering conglomerate which became Vickers-Armstrong

8. 11-Year-Old's Brain Tumor Discovered After Roller Coaster ...

   www.aol.com/11-olds-brain-tumor-discovered...

   Related: 8-Year-Old Boy's Dream of Skydiving Finally Comes True After Lazy Eye Led to Terminal Cancer Diagnosis (Exclusive) Campbell was diagnosed with medulloblastoma, a type of brain tumor that ...

9. Liquid-ring pump - Wikipedia

   en.wikipedia.org/wiki/Liquid-ring_pump

   Single-stage vacuum pumps typically produce vacuum to 35 torr (mm Hg) or 47 millibars (4.7 kPa), and two-stage pumps can produce vacuum to 25 torr, assuming air is being pumped and the ring-liquid is water at 15 °C (59 °F) or less. Dry air and 15 °C sealant-water temperature is the standard performance basis, which most manufacturers use for ...