131A Aluminium Alloy Sand or Die Castings (suitable for Pistons, etc.).
(1941), "Current D.T.D. and B.S. Specifications: I—A List of Ministry of Aircraft Production Specifications Revised to March, 1941", Aircraft Engineering and Aerospace Technology, Vol. 13 No. 8, pp. 231-234. https://doi.org/10.1108/eb030813
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