The following U.S. of A. patent Nr. 172943 for William Anson & John Deeley allows for the protection of the design of Daly #19:

http://www.google.com/patents/US172943?p...876&f=false

While other Dalys with the overhanging scears is covered by U.S. of A. Patent Nr. 305264 on September 16th, 1884(Nr. 4089, August 26th, 1882 in Great Britian) being held by William Anson solely but referred to as the Anson & Deeley Safety Bolt:

http://www.google.com/patents/US305264?p...882&f=false

It is possibly that Daly Nr. 19 was made between 1876 & 1884.

Kind Regards,

Raimey
rse