A screwdriver is a tool, manual or powered, for turning (driving or removing)
screws. A typical ... screwdrivers were used in Europe in the late Middle Ages.
They were probably invented in the late ...
In 1908, square-drive screws were invented by Canadian P. L. Robertson. ... than
a slot head because the screwdriver will not slip out of the screw's head during ...
The first mention of a screwdriver or something resembling a screwdriver in
history is assumed ... Some people believe that the screwdriver was invented
The history of the Roberston screwdriver, invented by P.L. Robertson, is detailed
Jun 12, 2013 ... He discovers that all of these tools were invented during the Roman age if ... To
remove a screw without a screwdriver, one actually has to cut ...
Mar 24, 2015 ... One out of three cocktails ordered in the US contain vodka, a spirit that pours in
$20 billion annually in sales, according to Victorino Matus, ...
And, Rybczynski discovered, the screwdriver is a relative newcomer in
humankind's arsenal of gadgetry, an invention of the late European Middle Ages
and the ...
Nov 1, 2012 ... The screwdriver was invented in Germany in the late fifteenth century. Originally
called a 'screwturner,' the first documentation of the tool is in ...
Who is the Phillips head screwdriver named after? ... Henry F. Phillips, of
Portland, OR, invented the X-shaped socket head screw for car makers who
needed a ...
Jan 21, 2011 ... If you've ever mistakenly grabbed the Phillips head screwdriver ... Historians
believe it was invented in Germany, but aren't sure exactly when.