Postcard from Germany!

Today I got a nice postcard from Germany! The postcard shows Dr. Otto Roth in 1902 using the first anesthetic apparatus, the Roth-Dräger. The machine allowed the user to precisely control the balance of oxygen and anesthetic agent, like chloroform and ether. This was developed with Johann Heinrich Dräger. During its first ten years, about 1,500 units were sold worldwide. The card was sent by my dad who visited Germany. Thanks Dad!