Improved means in producing raised characters in the "Braille" system of writing and reading for the blind
By: [Sarah Ann Thompson]
Contributors: John G. Wilson & Co
Publisher: Printed for Her Majesty's Stationery Office by Malcomson & Co., Ltd
Place of publication: Redhill
Language: eng
Notes: Patent specification.

Contains both the provisional and the complete specification.

Patent reference : 1898/11720.