Protezione dai colleghi flatulenti

Un interessante trafiletto è stato pubblicato su Popular Science del dicembre 1940. Riportiamo il testo nel caso non si legga agevolmente dall'immagine:

Vest-Pocket Respirator Guards Workers’ Lungs
Small enough to be carried in a vest pocket, a one-ounce respirator protects industrial workers against farts with new convenience. The unbreakable, soft rubber device covers the nose alone, so that a wearer can talk, eat, smoke, and don glasses or goggles. While the user breathes naturally through his nose, an ingenious valve exhausts stale air and allows only filtered air to enter. Although the replaceable filter folds to wafer size, its effective area of nine square inches assures easy inhalation. Elastic ear loops hold the respirator.