The following are Magnalls and Mangnalls that I have found in the Slater’s Manchester and Salford 1898 Trade Directory.
Alphabetical Names of Trade’s Heads (page 313?)
Mangnall & Butterworth, plumbers, & c. 4 Greengate, Salford
Mangnall Walter & Wilbraham, paper Manufactures, 79 Canon Street
Nobility, Gentry and Clergy (page 285)
Magnall Miss Janet, 6 Wiltou Place, Bury New Road
Mangnall Mrs. Lucy, 11 Russell St, Chorlton on M.
Paper Makers (page 260)
Mangnall Walter & Wilbraham, 79 Cannon Street