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In 1934, a patent for this design [5] was granted, and in 1949, a trademark for the name "Channellock" was granted, with a first-use date of May 1, 1932. [ 6 ] From this point to the 1960s, the company began to focus more on the fast-growing pliers side of its business, developing improvements to the original design.
The current design of pliers was developed and popularized by the Champion–DeArment Tool Company in 1934 under the brand name Channellock (after which the company was later renamed) [6] but are also now produced by a number of other manufacturers.
Medieval pincers found in Hamburg-Harburg (15th/16th century) As pliers in the general sense are an ancient and simple invention, no single inventor can be credited.Early metal working processes from several millennia BCE would have required plier-like devices to handle hot materials in the process of smithing or casting.
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
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Flight of six locks, in a quite ornate setting and including the UK's second deepest lock, [1] two pumping stations and several Grade II listed buildings. Bingley Five Rise Locks: Leeds and Liverpool Canal: grid reference: These staircase locks are the steepest flight of locks in the UK, with a gradient of about 1:5. Bow Locks: River Lee Navigation
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