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... Accumulators. If you see the signa ture C.A.V. stamped on an accumulator, you know it is the best, and one that will not let you down. Very rigidly constructed no buckled plates. C. A. Vandervell Co., Ltd., Acton, London, W. The most severe test for a carburetter is on an aeroplane under war conditions. Claudf.l Hobson Carburetters arc- undergoing this test with credit. H. M. Hobson, Ltd., 29, ...