earmuff articles
How old was Chester Greenwood when the idea for the earmuff struck him?
In what year was Chester Greenwood born?
Where was Chester Greenwood from?
Around what specific year is the genesis of the earmuff invention often placed?
When was the patent officially granted for the ear muff design?
What materials were used in Chester Greenwood's original earmuff design?
What is the name of the annual celebration held in the inventor's hometown?
Which national institution recognized Chester Greenwood's contribution posthumously?
What did the earmuff provide over pulling a heavy coat hood tightly over the head?
The enduring success of the earmuff is presented as a compelling case study in what design principle?