The Pocket Instra. impercetible in a pocket, and prevents chills : warmth is life.

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<p>Letter addressed to medical professionals promoting J.S. Barwick & Co.'s Instra, a "warmer" marketed to patients who suffer from symptoms of the Common Cold during the winter season.  Includes name and address of recipient.</p>

The Pocket Instra. impercetible in a pocket, and prevents chills : warmth is life.

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