759: 1955 Valves, gauges and other safety fittings for application to land boilers and to piping installations for and in ... The foreword gives recommendations on the installation of safety valves, blow down mounting, water gauges and fusible ... 1553, Pt. 4:1956 Graphical symbols for heating and ventilation installations (price 3s. 6d.) ... They can also be used for schematic diagrams and isometric drawings.
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