Patents for inventions. Abridgments of specifications. Class 2 (3)
Subtitle: Dyes and hydrocarbons and heterocyclic compounds and their substitution derivatives, period AD 1909-1925.
Publisher: HMSO
Published: 1921
Language: eng
Notes: Renumbered each year up to 1915; 100,001-24,4800 (1916-25).