Seven ships of the class were commissioned during World War I, and served well into the 1950s.

A number were refitted to serve as ocean-going tugs, salvage vessels, seaplane tenders, or submarine rescue ships.

The propulsion system consisted of 2 Babcock & Wilcox 200psi boilers and a 1,400shp Harlan and Hollingsworth triple expansion reciprocating steam engine.

The table makes no distinction between classification as "Minesweeper No.

This change affected all boats equally ca.