Begun privately in 1871, it was put under federal supervision and maintenance several years later.

In 1997 Wang reported having about 200 2200 systems still under maintenance around the world.

The airfield was put under care and maintenance on 1 July 1947.

As a result the station shuts down temporarily for under maintenance.

They said the problems were caused by under inflation and poor maintenance.

It is under control and maintenance of the Archaeological Department.

The airfield was put under maintenance in April 1945 and later became a government signals station.

Equipment under maintenance is not likely to present any problems, provided that these are correctly diagnosed.

Between 1948 and 1949 the site was placed under care and maintenance.

The unit stayed until 1948 before it was once again placed under care and maintenance.