John P. Thompson & the History of the 'Phillips' Screwdriver Patent | #history #oregon #oregonian #patents « Adafruit Industries – Makers, hackers, artists, designers and engineers!
NIHF Inductee Henry Phillips Invented the Phillips Screw
Henry Frank Phillips (1889 - 1958) - Genealogy
Q & A: Square Drive vs. Phillips-Head Screws | Popular Woodworking
A Tale of Twists - Inventors Digest
July 7, 1936: Get a Grip — Phillips Screws Up the Toolbox | WIRED
The Portland businessman behind the Phillips screw
Bit History: The Phillips | iFixit News
:max_bytes(150000):strip_icc()/101698197x-54cb682e8b6e42e3a950f130340a8e3c.jpg "What are Robertson screws?")
What are Robertson screws?
The History of the Phillips Screwdriver - Chris Duke
How the Phillips Screwdriver Took Over America
Phillips screw and driver
The Portland businessman behind the Phillips screw
John P. Thompson & the History of the 'Phillips' Screwdriver Patent | #history #oregon #oregonian #patents « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Phillips Head vs JIS Screwdriver - Japanese Industrial Standard
P. L. Robertson - Wikipedia
90 years ago, a Portland inventor patented the Phillips screw | kgw.com
When Was The Phillips Screwdriver Invented | Storables
Screwdriver - Wikipedia
Who Invented the Screwdriver? — EIO.com
History of Screwdrivers, from the Beginning till Now | Ronix Mag
The Valley Woodworker: The many faces of PHILLIPS
John P. Thompson & the History of the 'Phillips' Screwdriver Patent | #history #oregon #oregonian #patents « Adafruit Industries – Makers, hackers, artists, designers and engineers!
