lol at the number of cigarette inventions. They sure loved their cigarettes back then!
That laryngophone thing was, while rather unnecessary at the time, something that is widely used in the military today.
Oh just say Rongstang mentioned military applications. But yeah, definitely still used today, albeit with different technology coupled with the basic concept.
Being able to basically whisper extremely soft and still come in clear for someone with an earpiece anywhere else is just pure win.
Not very commonly fielded but they definitely exist.