No nations have adopted M49 as a mandatory standard.

It was adopted as an international standard in 1984.

This was adopted as a common standard by virtually all lens manufacturers.

China has officially adopted the AP1000 as a standard for inland nuclear projects.

This document has been adopted as a European standard.

Nonetheless, the simplicity of the Ringelmann scale means that it has been adopted as a standard in many countries.

But industry executives have resisted adopting Clipper as a standard for several reasons.

Mr. Levine's invention would work best if it were adopted as a universal standard for the entire country.

A five kingdom system has been adopted as a standard.

Many states have now adopted 0.08 as a standard, and the federal government has pushed others to do so.