All the drills had the shape of the spoon or hollow chisel until the spiral drill was invented. The spiral drills worked much faster. They became the popular tools along with the development of machines that produces these drills in the 60. of the 19th century. |
Wersja Polska
English Version
Deutschland
Slovensko
Česká republika 
)
)
)
){kind=link}
){kind=link}