Short answers, pulled from the story.
Leroy Grumman opened a small factory in Baldwin, New York on the 2nd of January 1930. The group had purchased an old Cox-Klemin Aircraft Co. facility to begin their new venture just months after registering their business on the 6th of December 1929.
The F6F Hellcat alone saw 12,275 units built between 1942 and the end of the war. Production of the majority of Wildcats and Avengers was subcontracted to a division of General Motors called Eastern Aircraft Division.
Grumman received the contract to build the Apollo Lunar Module on the 7th of November 1962. They built 13 lunar modules that served as the first spacecraft to land humans on the Moon with six of them successfully landing on the Moon.
The U.S. Marine Corps retired the last EA-6B Prowler on the 8th of March 2019 after decades of service. This aircraft was one of the notable designs delivered in the 1970s alongside the iconic F-14 Tomcat fighter jet.
The LLV was produced from 1987 until 1994 with an intended service life of 24 years. Some of these mail trucks were still in service in 2020 despite their age.