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2. The best stair lift for 2025: Chair lifts that make ... - AOL

   www.aol.com/lifestyle/best-stair-lift-134610076.html

   The best stair lift for 2025: Chair lifts that make navigating stairs a breeze With 12.2% of Americans struggling to walk or climb stairs, a stair lift can make a major difference in accessibility ...

3. Self-leveling concrete - Wikipedia

   en.wikipedia.org/wiki/Self-leveling_concrete

   Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]

4. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   A stair, or a stairstep, is one step in a flight of stairs. A staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades, and additional parts. [4] In buildings, stairs is a term applied to a complete flight of steps between two floors.

5. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...

6. LA-2A Leveling Amplifier - Wikipedia

   en.wikipedia.org/wiki/LA-2A_Leveling_Amplifier

   The LA-2A had evolved from Lawrence's first leveling amplifier, the LA-1, which was favored by Gene Autry, and its successor, the LA-2, which had been adopted by CBS and RCA. In 1965, Lawrence sold Teletronix to Babcock Electronics of Costa Mesa, California, and in 1967 Bill Putnam 's company Studio Electronics (eventually renamed UREI ...