indispensable person

See: key man
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References in classic literature ?
About herself, Sonia wrote that she had succeeded in making some acquaintances in the town, that she did sewing, and, as there was scarcely a dressmaker in the town, she was looked upon as an indispensable person in many houses.
The Indispensable Person in Health Award goes each year to a leader or researcher who shares the Alliance's vision for improving the health and lives of the elderly by investing in medical research.
This year, we are introducing an additional honor, the Indispensable Person in Health Research Award," Perry continued.
com wants to help management to give more than just the same old standards this Administrative Professionals Day and instead give extraordinary gifts for the most indispensable person on the team," said Allyson Campa, president and CEO of BravoGifts.
com urges management to give more than just the old standards of flowers and candy, and instead give extraordinary gifts for the most indispensable person on their team.