Sentence:  Operating in 1887 was the `` <WSD>Valley</WSD> 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 , assistant superintendent . 
Meaning of the word marked with <WSD> tags:  any number of entities (members) considered as a unit