According to the book Battle for the Elephants, in the year 1910 alone, about 700 tons of ivory (representing 13,000 slaughtered elephants) was used to make 350,000 keyboards in the United States.
Raamatu ” Battle for the Elephants ” sõnul kasutati Ameerika Ühendriikides ainuüksi 1910. aastal umbes 700 tonni elevandiluud (mis tähendab 13000 tapetud elevanti) 350000 klahvistiku valmistamiseks.