Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,742 pages of information and 211,892 images on early companies, their products and the people who designed and built them.
1886 Company formed to purchase the whole or any part of the business of Letts, Son and Co; half of the directors would be appointed by Cassell and Co and the remainder by Hazell, Watson and Viney Ltd; subscribers to the shares were publishers and printers 
1886 Cassell and Co issued a series of diaries bearing the name Letts
Letts' Diaries Co Ltd later became Letts Quickref Diaries