Still, no telling how effective his reinforcement would prove until the time came.

Although contested in the 1960s, the equation proved remarkably accurate, indeed even conservative, until the early 1990s.

That assignment proved relatively uneventful until the first week in May.

The enterprise proved a financial success until 1815, when it closed due to a shortage of fuel in the neighborhood.

This proved a very successful venture until the mid-1960s.

"But I never bothered really to prove it until college."

The session, held the evening of July 5, proved entirely unfruitful until late in the night.

America swung into action, and the pace proved hectic until the Christmas cease-fire.

Here a political agreement proved impossible until the Nice summit in December 2000.

The beer proved popular until the 1980s, when sales began to decline.