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2. Laser level - Wikipedia

   en.wikipedia.org/wiki/Laser_level

   The concept of a laser level has been around since at least the early 1970s, [2] the original spinning-mirror design laser plane and line level was patented by the late 1980s, [3] and the compact lens-based laser line level (as produced by many tool manufacturers today) was patented in the late 1990s. It was invented by Oscar Soliz in the late ...

3. Laser line level - Wikipedia

   en.wikipedia.org/wiki/Laser_line_level

   A laser line level is a tool combining a spirit level and/or plumb bob with a laser to display an accurately horizontal or vertical illuminated line on a surface the laser line level is laid against. Laser line levels are used wherever accurate verticals and horizontals are required, typically in the construction and cabinetry industries. Some ...

4. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   [1] [2] Other names for the tool include adjustable square, combo square, and sliding square. The most common head is the standard head, which is used as a square for marking and testing 90° and 45° angles. [3] The other common types of head are the protractor head, and the centre finder head. [4]

5. 14 Things That Might Be Causing Pain in Your Lower Left Abdomen

   www.aol.com/14-things-might-causing-pain...

   Old Navy's Break a Sweat Sale has activewear from $2 — shop our top picks here. AOL. AOL reviewed: This smart humidifier helps me sleep better in the dry winter months. See all deals.

6. The best White Elephant gifts that everyone will be jostling for

   www.aol.com/lifestyle/the-best-white-elephant...

   Silicone spatulas are among the most versatile tools for home chefs and bakers. This two-pack features a 10 and 10.5-inch spatula, one with a full spatula and one with a half one. $8 at Walmart

7. Straight-twin engine - Wikipedia

   en.wikipedia.org/wiki/Straight-twin_engine

   The most common crankshaft configurations for straight-twin engines are 360 degrees, 180 degrees and 270 degrees, [8] [9] [10] and even can 90 degrees and 450 degrees but uncommon. 360 degrees. In an engine with a 360 degree crankshaft, both pistons move up and down at the same time.