GasMasksUK

Application Date: June 1 1921 – 305,080 - Improvements in or relating to Gas Masks, Respirators and other like Apparatus – John Abrose Sadd

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Application Date: Sept 20 1922 – 297,890 - Improvements in or relating to Gas Masks, Respirators and other like Apparatus – John Abrose Sadd

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Application Date: Sept 29 1927 – 305,080 - Improvements in Gas Masks, Respirators and the like – John Abrose Sadd

 

Application Date: April 30 1928 – 289,808 - Improvements in and relating to Protective Gas Masks – Elfridge Draeger, nee Stange

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Application Date: April 30 1928 – 289,810 - Improvements in and relating to Protective Gas Masks – Elfridge Draeger, nee Stange

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Application Date: Jan 10 1935 – 455,099 - Improvements in Gas Masks, Respirators and the like – John Abrose Sadd