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  2. Carbon monoxide detector - Wikipedia

    en.wikipedia.org/wiki/Carbon_monoxide_detector

    The primary purpose of CO detectors is to sound an alarm to warn occupants of an enclosed space of a dangerous level of carbon monoxide. The alarm should sound within 60 minutes if the concentration rises to 70 PPM, within 10 minutes at 150 PPM, in 4 minutes at 400 PPM, and immediately at 500 PPM or greater.

  3. List of Washington (state) area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Washington_(state...

    Further splits in 1995 to create area code 360 for most of Western Washington, and 1997 to form area codes 253 and 425. 564 will be added to the 206 area in 2025. 509: January 1, 1957 [1] Eastern Washington, including Spokane, the Tri-Cities, Yakima, Walla Walla, and Wenatchee: Created in a split from area code 206. [2] 360: January 15, 1995 [3]

  4. Road signs in the United States - Wikipedia

    en.wikipedia.org/.../Road_signs_in_the_United_States

    Download QR code; Print/export Download as PDF ... Map showing state adoption of the 2009 edition of the Manual on Uniform Traffic ... Sheep. W11-18 Ram. W11-19 ...

  5. Steamboats of the Columbia River, Wenatchee Reach - Wikipedia

    en.wikipedia.org/wiki/Steamboats_of_the_Columbia...

    Okanogan coming downstream on the Okanogan River, circa 1910. Prior to the construction of dams, open navigability was never established throughout the Columbia.This was an important difference from the Mississippi-Ohio River system, which in the right season, and with a canal around the Falls of the Ohio, was navigable from New Orleans to Pittsburgh, an enormous distance.

  6. Local 4-H youth ready to exhibit at McDonough County Fair - AOL

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  7. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    ANSI standard INCITS 38:2009 replaced the Federal Information Processing Standard (FIPS) standards FIPS 5-2, FIPS 6-4, and FIPS 10-4. The ANSI alphabetic state code is the same as the USPS state code except for U.S. Minor Outlying Islands, which have an ANSI code "UM" but no USPS code—and U.S. Military Mail locations, which have USPS codes ...

  8. I measured CO2 levels on a plane: It showed me when I was ...

    www.aol.com/took-co2-detector-flight-showed...

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  9. List of airports in Washington (state) - Wikipedia

    en.wikipedia.org/wiki/List_of_airports_in...

    The state also has several military airports and private airfields. [1] [2] Public airports owned by municipal corporations, including public port districts, were authorized by the Washington State Legislature in 1941. [3] This list contains all public-use and military airports in the state, grouped by type and sorted by location.