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2. Tilt up - Wikipedia

   en.wikipedia.org/wiki/Tilt_up

   Tilt-up, tilt-slab or tilt-wall is a type of building and a construction technique using concrete. Though it is a cost-effective technique with a shorter completion time, [ 1 ] poor performance in earthquakes has mandated significant seismic retrofit requirements in older buildings.

3. 30' surf rescue boat - Wikipedia

   en.wikipedia.org/wiki/30'_surf_rescue_boat

   The 30 foot surf rescue boat is a lifeboat that the United States Coast Guard has used in recent years. The 30' long boat is designated the surf rescue boat (SRB) and was introduced in 1983. The 30' long boat is designated the surf rescue boat (SRB) and was introduced in 1983.

4. London - Wikipedia

   en.wikipedia.org/wiki/لندن

   London is an ancient name, attested in the first century AD, usually in the Latinised form Londinium. [36] Modern scientific analyses of the name must account for the origins of the different forms found in early sources: Latin (usually Londinium), Old English (usually Lunden), and Welsh (usually Llundein), with reference to the known developments over time of sounds in those different languages.

5. Han dynasty - Wikipedia

   en.wikipedia.org/wiki/Han_dynasty

   The Han dynasty [a] was an imperial dynasty of China (202 BC – 9 AD, 25–220 AD) established by Liu Bang and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–206 BC) and a warring interregnum known as the Chu–Han Contention (206–202 BC), and it was succeeded by the Three Kingdoms period (220–280 AD).

6. Elevator - Wikipedia

   en.wikipedia.org/wiki/Elevator

   This rheostat (see picture) was enclosed within a cylindrical container about the size and shape of a cake. This was mounted upright or sideways on the cab wall and operated via a projecting handle, which was able to slide around the top half of the cylinder. The elevator motor was located at the top of the shaft or beside the bottom of the shaft.

7. Tang dynasty - Wikipedia

   en.wikipedia.org/wiki/Tang_dynasty

   Upon its completion in 801, the map was 9.1 m (30 ft) in length and 10 m (33 ft) in height, mapped out on a grid scale of one inch equalling one hundred li. [317] A Chinese map of 1137 is similar in complexity to the one made by Jia Dan, carved on a stone stele with a grid scale of 100 li . [ 318 ]