He also played a key role in most of the other new systems.

A strong focus on music in the family home also played a key role.

The foreign companies continued to play a key role in the oil industry.

We want to play a key role in the future.

Instead they had a key role to play in the attack.

If the Union takes a united stand, we can play a key role.

I believe that you have a key role to play here.

The first is the key role played by model building.

The paper played a key role in the campaign against the war for the next four years.

He played a key role in the development of the American film industry.