A "digest cross-reference" is a cross-reference formed from abstracts or extracts from a patent consisting of illustration and text cut from a photolithograph of a patent and mounted.    From Wordnik.com.  [The Classification of Patents] Reference

By printing the same image four ways -- as a halftone photolithograph, continuous tone photolithograph, photogravure and salt print -- the subtle shifts and changes that occur through these varied processes become evident.    From Wordnik.com.  [Jane Chafin: Exit Through the Gift Shop (The Emperor Is Naked)] Reference

A "search-card" is a sheet of the size of a photolithograph of a patent placed with the photolithographs of patents forming a subclass in the examining division and public search room, and containing suggestions for further search, and on the copy for the search room, a definition of the subclass.    From Wordnik.com.  [The Classification of Patents] Reference

Photo credit: AP | This undated photo provided by Bonhams & Butterfields shows a 1960s signed photolithograph named "Aloha - Duke.".    From Wordnik.com.  [WN.com - Articles related to Dog days of summer: Surfing pets take to the water for charity] Reference

Restored photolithograph/Courtesy National Archives.    From Wordnik.com.  [Wired Top Stories] Reference

(13) Whether cross-reference notations are written on a separate slip or on the photolithograph, the number of the class and subclass into which.    From Wordnik.com.  [The Classification of Patents] Reference

(12) Should it be found that the handling of copies in making examinations detaches the cross-reference slips, it may be advisable to mark lightly but legibly in pencil on the lower right-hand corner of the examiner's photolithograph the number of the subclass or subclasses into which it is to be cross-referenced, or the number of the class and subclass in case it is to be cross-referenced to another class.    From Wordnik.com.  [The Classification of Patents] Reference

Anita Bunn, untitled, 2010, halftone photolithograph, 18" x 14" framed.    From Wordnik.com.  [Jane Chafin: David Hockney's iPad Art in France] Reference