[LB050381], Letter from Thomas Alva Edison to Edison General Electric Co, Samuel Insull, July 21st, 1891
https://edisondigital.rutgers.edu/document/LB050381
Transcription
July 21st 1891 Sam Insull Esq. Second Vice President Edison General Electric Co New York Dear Sir: The following is a list of my inventions which have introduced economy in Lamp manufacture and which come within the scope of my contract with your Company of October 1st/90 Machines for sealing in lamps Use of straight inside part New Platina Seal Dipping of vacuum pump tube in collodion (savings in Labor and glass) There are other things outside the Lamp Factory which have not yet been used to any appreciable Extent. Those which I have named are new and have been in use for a year or more, excepting the platina. I believe the Lamp Factory have a record of the [-----] quantities and [------] of saving Yours truly Thomas A. Edison