Whiteboard
Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Dry-erase markers for whiteboards were invented in 1975.
BPB plc
The development of plasterboard (a sandwich of gypsum plaster between two sheets of paper) dates back to the late nineteenth century in the USA. The first patent was granted in 1894 but it was not until an American, Frank Culver, persuaded his new employer, Thomas McGhie and Sons, to buy a plasterboard plant from the USA that this new product was introduced to Britain. A site was acquired at Wallasey Cheshire and building started in 1916. However, McGhie's shareholders could not supply sufficient funding and in 1917 the plasterboard assets were sold to a new company, British Plaster Board Limited [BPB].