Specification for graphical symbols for general engineering  part 1  piping systems and plant. 

 - London  British Standard Institution  1977. 
 - 32 p. : ill. ; 27 cm. 
 - BS1553  part 1 : 1977 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pipe--fittings--Signs and symbols.