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2. Yamabiko Corporation - Wikipedia

   en.wikipedia.org/wiki/Yamabiko_Corporation

   Yamabiko Corporation. The Yamabiko Corporation (株式会社やまびこ, Kabushiki-gaisha Yamabiko) is a Japanese manufacturer of power tools formed with the September 2008 merger of the Kioritz and Shindaiwa corporations. The brands owned and distributed by Yamabiko are Kioritz, Shindaiwa and Echo. The Yamabiko Corporation is based in Ome, Japan.

3. Thunderbolt (siren) - Wikipedia

   en.wikipedia.org/wiki/Thunderbolt_(siren)

   The Thunderbolt siren was developed between 1952 and 1990. It was the first "supercharged" siren, which uses a blower to force air into the rotor, greatly increasing the siren's volume. In the 1980s, when civil defense fell into disuse, thunderbolts across the United States were repurposed for nuclear and storm warning siren systems.

4. Echo suppression and cancellation - Wikipedia

   en.wikipedia.org/wiki/Echo_suppression_and...

   Echo suppressors were developed in the 1950s in response to the first use of satellites for telecommunications. Echo suppression and cancellation methods are commonly called acoustic echo suppression (AES) and acoustic echo cancellation (AEC), and more rarely line echo cancellation (LEC). In some cases, these terms are more precise, as there ...

5. Snag this refurbished Echo Show 15 for 31% off - AOL

   www.aol.com/snag-refurbished-echo-show-15...

   Save $70: As of August 4, you can get a refurbished Echo Show 15 at Amazon for just $154.99 instead of $224.99 — a discount of 31%. Opens in a new window Credit: Amazon Refurbished Echo Show 15 ...

6. Get your very own refurbished Echo Dot for 26% off - AOL

   www.aol.com/news/very-own-refurbished-echo-dot...

   Save $14: As of July 17, the Certified Refurbished Echo Dot (5th Gen) is on sale for $39.99 at Amazon, which is 26% off the item's regular price of $53.99. Opens in a new window Credit: Amazon ...

7. List of sirens built by Alerting Communicators of America

   en.wikipedia.org/wiki/List_of_sirens_built_by...

   1 or 2 (chopper) 25/30 (blower) 8/8, 8/10, 8/12, 10/10, 10/12, 12/12 1967-1972 (square horn) 1972-1981 (round horn) Rotating 130 dB at 100 ft. Started off using a direct drive 25HP Roots blower with a square horn, redesigned to a belt drive 30 HP blower with round horn. All known recordings are 8/10 port ratio.