4. Ammunition and explosives
  5. Blasting
  6. Contained blasting charge

Donald H. Douglas

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Explosive stemming device

Ammunition and explosives – Blasting – Contained blasting charge
Patent

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Method and apparatus for installing a well

Wells – Processes – Graveling or filter forming
Patent

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Weather-proof, vandal-proof, changeable display sign

Card – picture – or sign exhibiting – Signs – Modular
Patent

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Profile ID: LFUS-PAI-P-459462

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