Four years later, he opened the Sikorsky Aero Engineering Corporation in New York.

VOA: special.2010.09.10

Mrs Johnson had worked at Cromer's Homebase store since it opened four years ago.

BBC: Keith Johnson

The Barcelona to Madrid line, which opened four years ago, has also seen an increase in ridership.

BBC: Corporate rail travel on the rise

This year McDonald's will add only 150 new U.S. stores, down sharply from the 1, 100 it opened four years ago.

FORBES: Beyond burgers