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In 1950, Alfred O. Nier developed this portable mass spectrometer for real-time monitoring of exhaled gases from the trachea of patients under anesthesia. The peripherally related legal matter ruled in favor of the U.S. Tax Court that a medical fellow on the project should have reported his fellowship award as taxable income. Reproduced with permission from ref (6). Copyright 1950 American Society of Thoracic Surgery.
