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Improvements in or relating to lethal chambers for the destruction of animals / [Bertram Richardson].
- Richardson, Bertram.
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About this work
Redhill : Printed for His Majesty's Stationery Office by Love & Malcomson, Ltd, 1904.
6 pages, 2 folded leaves of plates : illustrations
Contains both the provisional and the complete specification
Patent reference : 1904/2290