Eleven disposable cardboard mouthpieces
Eleven disposable cardboard mouthpieces, adult size
Monaghan pulmonary function analyser (electronic spirometer) model 403, by Hospal Medical Corporation, Colorado, USA, 1977
Eleven disposable cardboard mouthpieces, adult size
Twelve disposable cardboard mouthpieces, paediatric size
Pad of pulmonary function testing record sheets
Slide-rule type "Pulmonary Function Analyzer"