Reference index.
Published: 1959
Place of publication: [Calcutta?
Language: eng
Subjects: Patents -- India -- Indexes.; Patents -- Classification.
Notes: Cover title.
Vol. 1 issued without volume statement.
Vol. 1: 125 copies; v. 2: 150 copies; v. 3: 175 copies.
"For official use only."
Table of contents: title: [1] Headings in the classification key.; title: v. 2. Catchwords and phrases to headings in the classification key.; title: v. 3. Cross reference to sub-classes and classes in the classification key.