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...ransconductance [[analog multiplier]]s (which remain expensive in the 21st century{{sfn|Tyler|Kirkwood|2008|p=346}}) or simpler and cheaper [[log amplifier|lo [[Category:American inventions]] ...

[[Category:21st-century inventions]] ...

...№ 2 681 420|publisher=www1.fips.ru |accessdate=21 January 2019}}</ref> for inventions in [[optical engineering]]. [[Category:20th-century Russian physicists]] ...

...rs, and [[dbx (noise reduction)|dbx noise reduction systems]]. In the 21st century, the Blackmer cell, along with Douglas Frey's [[Operational Voltage Control ...founded and owned by Blackmer, was the first company to commercialize his inventions]] ...

{{See also|Islamic science|Inventions in medieval Islam|Timeline of Islamic science and technology|Academy of Gun ...or [[panemone windmill]] first appeared in [[Greater Iran]] during the 9th century.<ref>Glick, Thomas F., Steven Livesey, and Faith Wallis. Medieval science, ...

...ially successful internal combustion engines were invented in the mid-19th century. The first modern internal combustion engine, the [[Otto engine]], was desi ...last=Suzuki |pages=87–94 |publisher=SAE |year=1997}}</ref> and in the 21st century [[Ilmor]] designed and successfully tested a 5-stroke double expansion inte ...

...ce is needed to distribute fine filler (for example) through the material. Inventions such as the "cavity transfer mixer" have been developed to produce multiple ...in size modes; Proc. Internat. Association of Sedimentology, Report of the 21st Session Norden, Internat. Geol. Congress, p.&nbsp;119 - 129. ...

...in [[Sistan]], an Eastern province of [[Persia]] (now Iran), from the 7th century. These "[[Panemone windmill|Panemone]]" were vertical axle windmills, which ...ingstoke, Hampshire |year=2002 |isbn=978-0-333-79248-3}}</ref> By the 14th century, Dutch windmills were in use to drain areas of the [[Rhine]] delta. Advance ...

In the 17th century, prototypes of elevators were installed in the palace buildings of England ...elevators in use today. Starting in coal mines, elevators in the mid-19th century operated with [[steam power]], and were used for moving goods in bulk in mi ...