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2. Arthur L. Parker - Wikipedia

   en.wikipedia.org/wiki/Arthur_L._Parker

   Arthur LaRue Parker (November 16, 1885 – January 1, 1945) was an American businessman and inventor, known for founding Parker Hannifin Corporation (then known as Parker Appliance Company). Early life and education

3. Solenoid valve - Wikipedia

   en.wikipedia.org/wiki/Solenoid_valve

   Solenoid valves. A solenoid valve is an electromechanically operated valve.. Solenoid valves differ in the characteristics of the electric current they use, the strength of the magnetic field they generate, the mechanism they use to regulate the fluid, and the type and characteristics of fluid they control.

4. Charles Parker Company - Wikipedia

   en.wikipedia.org/wiki/Charles_Parker_Company

   The Charles Parker Company was in operation until the 1970s. In 1973, the company participated as an exhibitor at the Eastern States Exposition in West Springfield, MA. [6] Among the diversity of Charles Parker products, Parker guns are very actively collected and traded, including the historical catalogues illustrating the designs.

5. Thomas Parker (inventor) - Wikipedia

   en.wikipedia.org/wiki/Thomas_Parker_(inventor)

   Thomas Parker FRSE MICE (22 December 1843 – 5 December 1915) was an English electrical engineer, inventor and industrialist.He patented improvements in lead-acid batteries and dynamos, and was a pioneer of manufacturing equipment that powered electric tramways and electric lighting.

6. Parker Hannifin - Wikipedia

   en.wikipedia.org/wiki/Parker_Hannifin

   Parker-Hannifin Corporation, originally Parker Appliance Company, usually referred to as just Parker, is an American corporation specializing in motion and control technologies. Its corporate headquarters are in Mayfield Heights, Ohio , in Greater Cleveland (with a Cleveland mailing address).

7. Mullard - Wikipedia

   en.wikipedia.org/wiki/Mullard

   A Mullard TDD4 valve. The gold spray coating served no purpose other than to hide the blackened interior, as Mullard valves were still manufactured using the azide process, long abandoned by other makers. [1] A Mullard EL34 power pentode An EL84 valve made in Russia in the 21st century. Mullard Limited was a British manufacturer of electronic ...