Collection search - H.J. DERHAM, OTTAWA. LTR. ON HIS NEW METHOD OF INDEXING PATENTS. (D.C.O.)
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Record information – Brief 
H.J. DERHAM, OTTAWA. LTR. ON HIS NEW METHOD OF INDEXING PATENTS. (D.C.O.)
Hierarchical level:FileDate:1887/05/25,1887/06/04Reference:RG17, Volume number: 537, File number: 59879File no. (creator):59879Type of material:Textual materialFound in:Archives / Collections and FondsItem ID number:1946289Context of this record: -
Record information – Details Date(s):1887/05/25,1887/06/04Place of creation:No place, unknown, or undeterminedLanguage of material:UndeterminedFinding aid no.:Additional information:Subject heading:Source:GovernmentFormer archival reference no.: -
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