Likely based on Waldenburg’s spirometry and therapy of compressed and rarified air for respiratory diseases. From: George Tiemann and Co. Catalog, The American Armamentarium Chirurgicum, 1879, page 99.
Likely based on Waldenburg’s spirometry and therapy of compressed and rarified air for respiratory diseases. From: George Tiemann and Co. Catalog, The American Armamentarium Chirurgicum, 1879, page 99.