Sentence:  Operating in 1887 was the `` Valley Telegraph Line '' , officers of which were E. C. Orvis , president ; H. K. Fowler , vice-president and secretary ; J. N. Hard , treasurer ; F. H. Walker , superintendent ; H. S. Walker , <WSD>assistant</WSD> superintendent . 
Meaning of the word marked with <WSD> tags:  of or relating to a person who is subordinate to another