With this issue we revive a feature which appeared regularly up to June, 1940, when it was perforce discontinued. The details are taken, by permission, from the officially prepared abridgments classified in Groups. Sets of Group abridgments can be obtained from the Patent Office, 25 Southampton Buildings, W.C.2, sheet by sheet as issued, at a subscription of 10s. per Group. Copies of the full specification are obtainable at the same address, price 1s. each. As the sheets are published at irregular intervals the appearance of this feature each month cannot be guaranteed.
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