SWAN, Circuit Judge.
The Blanchard patent is for a revolving door of the type known as the "full collapsible panic proof" type. A panic-proof revolving door is one whose four wings, which project radially from a central upright rotary support and revolve in fixed relation with it under normal use, are so arranged as to be capable of collapsing in response to abnormal pressure applied to wings on opposite sides of the central shaft so as to fold together like the leaves...
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