PATENTS

      184.            BIEDERBECK, H.  (Ruhrchemie A. G.).  [Sluice-like Device for Feeding Small-Lump Reagents Into Gas-Treating Installations.]  German Patent 729,729, Nov. 26, 1942 (Cl. 12 f-4).  Chem. Abs., vol. 38, 1944, p. 284.

                        See abs. 713.