they are part of the first aid system
Roger Aid in Conneticuit in the year 1847.
The things that should NOT be in a first aid box are plasters, knives and you must always NOT take scissors.
amrica in 1878
The red cross is the universal first aid insignia.
Justin bieber
Hearing aid trumpets were used as early as the 16th century. The first electric hearing aids were invented at the beginning of the 20th century as electric amplifiers.
In 1958, the first box-enclosed loudspeakers were invented
Charlie white invented the first chocolate candy box for v_day!
a cat
It is uncertain who invented the first electric hearing aid, it may have been the Akoulathon, invented in 1898 by Miller Reese Hutchinson and made and sold (1901) by the Akouphone Company of Alabama for $400. The first non electronic hearing aid was invented in the 17th century, and the first electronic hearing aid was invented in 1898. There are now digital hearing aids since the year 1996.
Technically it was the Johnson and Johnson company in 1890. They called it the Johnson and Johnson's First Aid Cabinet. Back then, it only contained the bare essentials of a first aid kit.