PATENT SPECIFICATION No.446,810. APPLICATION DATE: September 21, 1935 (Belgium); December 11, 1935 (UK). SPECIFICATION ACCEPTED: May 6 1936. TITLE: IMPROVEMENTS IN RESPIRATORY EQUIPMENT PARTICULARLY FOR GAS MASKS. APPLICANT: SOCIETE ANONYME DES GAZ INSUSTRIES. S.O.G.A.Z. of 30 Avenue Rittweger, haren-Nord, Brussels, Belgium. Size: 195mmx270mm. No. of pages of text: 2. No. of pages of drawings: 1. Size of page of drawing/s: 300mmx225mm. Brief Description of Patent: This invention relates to respiratory equipment and more particularly to such equipment in association with gas masks and the like and comprising in particular a cylinder or vessel for supplying oxygen, and air purifying cevice and a collapsible reservoir. Condition: Slight crinkling. Multiple Item Postage: Patents can be combined for postage costs, the cost is the same whether you purchase one or several, so check out our Ebay Shop patent listings as well. This patent specification has been disbound from a volume of 100 different patents. This is an original HMSO published item at the time, not a modern copy as are being sold elsewhere. The drawings are often ideal for framing. It is part of a collection of several volumes from the 1893-1900,1907 & 1920/50's that I have from which individual patents will be sold over the next few years.