Budding is also credited with the invention of the screw adjustable spanner. Budding is also credited with the invention of the screw adjustable spanner in 1842. English engineer Richard Clyburn is credited with inventing an adjustable spanner in 1842. Johansson also improved the adjustable spanner, patenting in 1891. He invented a modern adjustable spanner (patents in 1891 and 11 May 1892).