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I'he contents of this Abridgment Glass may be seen from its Subject-matter Index, which includes all index headings, subheadings, and subdivisions allotted to this Class, as well as crossreferences under them, although there may be no cases affected within the period covered by this volume. A revised edition of the Abridgment-Class and Iruleo: ](ey showing Abridgment Classes and Index Headings to which inventions are assigned in the official publications of the Patent