Hobbs' Parautoptic key from his book 'The Construction of Locks and Safes, 1850' also showing the individual key bits which could be assembled into the key in any order to effectivly change the combination of the lock.
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Branded and Patent Keys
S J Arnheim - Berlin, Germany - founded 1833
  
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Lammellenschloss folding key. 164mm extended, 83mm folded.
(1900. DRP 115400)
| Radial lock key bit. 20mm.
(1907. DRP Patent 216509)
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Fuhrmann - Berlin, Germany
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| Corkscrew action key. 74mm.
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Gibbons - Wolverhampton, England
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| Early Victorian cell door key. 109mm, c1848
| Prison cell key. 107mm c1911
| Prison cell block master key. 107mm c1911
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Hobbs - London, England
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| c1855 | 109mm
c1855 | 133mm. c1860 |
Keys for the Hobbs Parautoptic Bankers Change key Lock
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Mathys DeClerck
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| Bramah Chubb style key. 80mm.
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Parnell
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| Brass key with steel sliding bit. 132mm
| Padlock key. 37mm.
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Yale - USA
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Treasury Bank Lock Key Stem and Bit.
Bronze stem, 145mm and steel bit.
Patented by Linus Yale jr. in 1860 the Treasury bank lock key featured a detachable bit in which the individual key steps could also be rearranged. The lock was adopted by the US Treasury Department.
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BRANDED & PATENT KEYS
The story of the development of locks told through keys.
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