Two way communication must be established prior to aircraft entering the zone.

The station was established some time prior to 1900.

Boxing became firmly established at the Arena prior to the war.

Pachisi may be quite ancient, but so far its history has not been established prior to the 16th century.

It was established in 2003, prior to the opening of "Cris".

The name became established in Galloway prior to the 13th century.

The university was established by nationalist Muslim leaders in 1920 prior to partition.

It was established prior to 2003, when 150 additional trees were planted.

Oil field developments have the advantage that a contract and a buyer need not be established prior to development.

It was first established prior to the 1913 state election.