With Robertson and even Phillips widely available, why in the world

The square-head screw was invented by P I Robertson, a Canadian, in 1908 It offered a big advantage over the slotted screw head because

With Robertson and even Phillips widely available, why in the world This zinc-plated, round head machine screw has a squareslot drive and a size three driver It is 12-24 x 12 inch and available in a box of 100

The square-head screw was invented by P I Robertson, a Canadian, in 1908 It offered a big advantage over the slotted screw head because

slot onlin slot-head screw was the standard for fastening to wood It's the Even better is the Robertson, or square-drive screw--a favorite of

Robertson screwdrivers are used for screws with a square-shaped slot Importance of Screwdrivers Screwdrivers are essential tools that are used in various

slot games casino free HARDWARE MSR-004100 4-40 1 ROBERTSON-SLOT BOLT SCREW 100PACK HARDWARE MSR-004100 4-40 1 ROBERTSON-SLOT BOLT SCREW 100 Larger Photo

One thing The History Guy left out is that practitioners of a brand new industry preferred Robertson screws