Mortice deadlock (Butters System of 1955) by Josiah Parkes and Sons Ltd of Willenhall
1978
Two of three keys for mortice dead lock
Mortice escape deadlock (Butters System of 1955) by Josiah Perks and Sons Ltd of Willenham
1978
Tann's seven inch reliance-guarded seven lever one-sided detector dead lock with key
1843
Parson's balance lever double-sided rim dead lock
Eight inch one-sided dead lock
1830
Chubb's five one-sided six leaver detector rim dead lock
1844
Eight inch five lever one-sided rim dead lock
Tintan double cylinder security mortice deadlock
Ten-lever 'Impregnable' rim automatic deadlock and keys
1973