220557-A is referenced by 132 patents.
220,557. Wingfield, B. R. Feb. 6, 1924. Steam-traps.-A capsule for a steam-trap has a rigid plate 1 corrugated on the inside in order that the diaphragm 3 may be corrugated after being brazed or welded to the plate 1. The end of the filling tube 4 is closed by brazing or welding whilst the capsule is under water and is then embedded in a groove in the plate 1. Specification 180,124 is referred to.