Spirometer attributed to Dr. Lance and M. Javary. Exactly how it worked is unclear. It may be a lung exercise device. From a Collin and Cie medical equipment catalog, Paris France, page 6. 1935. From the Biusante Website.
Spirometer attributed to Dr. Lance and M. Javary. Exactly how it worked is unclear. It may be a lung exercise device. From a Collin and Cie medical equipment catalog, Paris France, page 6. 1935. From the Biusante Website.