The metal workers' agreement of December 1969 was the key breakthrough on pay and conditions.

I had toyed with it for years and then put in three years of very serious work before hitting the key breakthrough.

Dumonia explained that he could do a lot, but the key breakthrough eluded him, the point of her own insecurity regarding me.

The key breakthrough, the inventor said, was understanding the complex way the stress of pumping is distributed through the elliptical shape.

But Nadal made a key breakthrough in the 10th game of the fifth set to finally secure victory in five hours and 14 minutes.

Pollack thinks we're living in the time when some key scientific breakthrough will prove there is a Creator.

The LRA almost always attacked at night so this was a key breakthrough.

Over the ages, key technical breakthroughs have often had no direct link to pure science.

The key breakthrough in firefighting arrived in the 17th century with the first fire engines.

The 2004 election cycle saw two key breakthroughs of his that fundamentally changed how elections, conventions, and even daily news can be produced.