Question: When was the elevator at the Lincoln Memorial installed?
About the article "Lincoln Memorial", section "Interior".

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Starting in the early 1980s, portable lighting was occasionally installed for late-autumn games shown on national television, usually those against the University of Oklahoma.
The first proper night game at Memorial Stadium took place on September 6, 1986, when Nebraska defeated Florida State 34–17. 
"Elevator Action" was followed by "Elevator Action Returns" in 1994 and "Elevator Action EX" in 2000.
Two games for Palm OS, "Agent Z" and its sequel, "Agent Z 2" by Ellams Software, are based on "Elevator Action".
"Dexter's Laboratory: Robot Rampage!"
released for Game Boy Color in 2000, is based on "Elevator Action II".
In 2007, 505 Games released a game similar to "Elevator Action" for the Wii, titled "" ("Elevator Combat" in Europe).
Revealed at AOU 2009, "Elevator Action: Death Parade" is a lightgun shooter that uses elevator doors when changing scenarios.
A game titled was released for mobile phones in Japan. 
In 1999 the University of Nebraska-Lincoln installed FieldTurf in Memorial Stadium.
In 2006, Nebraska installed new FieldTurf that alternates between two shades of green every five yards.
Texas Tech University installed FieldTurf in Jones AT&T Stadium.
Nevada installed FieldTurf at its Mackay Stadium in 2000.
The playing surface had been natural grass for 34 seasons.
FieldTurf was installed at Qwest Field (originally Seahawks Stadium) in 2002.
The original plans called for a natural grass field at the new stadium, but due to the favorable reactions from players while playing at Husky Stadium, the Seahawks had FieldTurf installed instead.
On Tuesday, April 29, 2003, the Georgia World Congress Center Authority announced that it had selected FieldTurf as the new surface for the Georgia Dome, replacing the AstroTurf surface in use at the Dome since its inception in 1992.
Washington State University installed FieldTurf at its Martin Stadium in 2000.
The University of Oregon installed NexTurf in Autzen Stadium in 2001 but the surface did not perform as expected and during remodeling in 2002 it was removed and replaced with FieldTurf.
The University of Utah installed FieldTurf in 2002 and replaced it with 2009.
Colorado State installed FieldTurf at its Hughes Stadium in 2006.
The playing surface had been natural grass for 38 seasons.
The New England Patriots installed FieldTurf midway into the 2006 NFL season.
The installation was made during a week when the team was on the road.
In 2004, Rutgers Stadium in Piscataway, New Jersey installed FieldTurf where the Rutgers Scarlet Knights football team plays.
In 2007, the Saskatchewan Roughriders, a Canadian Football League (CFL) team, installed FieldTurf in Mosaic Stadium at Taylor Field.
In April 2008, FieldTurf was installed at the new baseball stadium of Calvert Hall High School in Towson, Maryland, designed by Baltimore Orioles baseball great Cal Ripken. 
This elevator and accompanying annex was built 1957–1960.
It was UGG's second elevator at Warner, the first having been sold to Alberta Pool Elevators in 1928.
It was licensed for in 1960.
The elevator has had substantial upgrading in the late 1980s, including the installation of a new leg that has required heightening part of the cupola roof.
The metal bin annexes on the south side, complete with drag auger, also date from this time.
A cyclone dust collector and truck loading spout have also been installed.
A roofed warehouse located track-side on the north side of the elevator, was most likely built at the same time as the elevator.  
The Minato Ward 2006 elevator accident was an incident in June 2006 which shook Japanese public confidence in the safety of elevators around the country.
In June 2006, in Minato, Tokyo, a 16-year old high school student was killed by an elevator not maintained by SEC Elevator Co Ltd but of another elevator maintenance company.
He was backing out of it with his bicycle when the elevator suddenly rose with the doors still open, causing asphyxiation.
Investigations began relating to this fatality.
In the process of this investigation, elevator safety in Japan came under question, with media attention focused on Schindler Group, the Swiss based elevator manufacturer.
Of the 8,800 Schindler elevators installed in Japan, 85 have trapped people.
Following the incident, the Minato Ward public housing corporation replaced all five Schindler elevators in the condominium with elevators from another manufacturer.