GB Patent: GB-539,497 
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| Improvements In Or Relating To Electric Switch Apparatus With Safety Doors Or Cover-plates 
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	        Patentees:
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 | George Adcock (exact or similar names) - Leicester,  England |  
| Howard Shipley (exact or similar names) - Leicester,  England |  
 
 
 
 
 
 
 
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        Patent Dates:
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| Applied: | 
Apr. 02, 1940 | 
 
| Granted: | 
Sep. 12, 1941 | 
 
 
 
Espacenet patent 
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                        Joel Havens "Vintage Machinery" entry for Adcock & Shipley Ltd. 
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        Description: |  
| When the lid 12 of a switch box 10 is opened. a curved lever 16 which bears against the lid is moved by a spring 17 into the dotted position, causing the rotation of a shaft 15 and the moving of contacts 14a, carried by the shaft, into the "off" position. |  
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