Synonyms for ballon d'essai
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EXAMPLES FROM THE WEB FOR BALLON D'ESSAI
This is no doubt what is technically known as a ballon d'essai.
In the autumn of 1916 the newspapers put forth a ballon d'essai.
That was a ballon d'essai, as they call it, and they think it was a very happy one.
And in the early morning she had sent her note to Kitty—a ballon d'essai, despatched in a horror of great fear.