1851 Great Exhibition: Official Catalogue: Class VI.: John Birch
406. BIRCH, JOHN, Edward Street, Regent's Park — Inventor.
Model of a machine designed and used for the purpose of cutting sash and roof bars, and applicable to the preparation of mouldings, etc. It is so contrived as simultaneously to work the two sides of the bars or mouldings. The cutter blocks are so contrived as to work seven bars at the same time.