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# Being without springs, there are none to fail; it is impossible to damage by fire, dampness, or neglect. The design rid itself of the vices of the springs that become rusty or softening by heat or moisture.
# The lock has a head that is detached from its key-bits, thus leaving a space between the head and the key-hole, making it virtually impossible to be picked.
# When the key is withdrawn, all print or record of its action is obliterated, and no tell-tale left for duplicate keys to be made
# Powder proof. No powder

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