The coca plant is the source of the coca leaf used in medicine and in the production of cocaine
The first person to vulcanize rubber, a process discovered in 1839 and patented in 1844.
An illustration of the flower (a) and the fruit (b) of the gutta-percha. Gutta-percha (Palaquium) is…
A mallet is a type of hammer with a head made of softer materials than the steel normally used in hammerheads,…
A tire is a ring shaped covering that fits around a wheel to protect it and enable better vehicle performance…
This medical topical applicator is a tool used to apply cold or hot fluid throughout the patients body.…
"Over the upper end of a cylindrical receiver, tie tightly a wet bladder or sheet of writing paper and…