proved strength

See: proof
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References in periodicals archive ?
The joint talks held, he said, have proved strength of fraternal bonds between our fraternal countries and serious willingness to deepen cooperation, consolidating and promoting relations, in all fields, in line with the vision of the Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al Saud and the president, to best serve the interests of the two brethren peoples.
the proved strength of the company's partners in the Chinese market and their technology and the extensive and deep rooted business contacts of the company's Boards and its significant shareholders.