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Feb., 1930] PROGRESS REPORT 253
308,784; 308,839; 308,840; U. S.Pats. 1,698,106; 1,704,189; 1,707,625; 1,707,767; 1,708,087; 1,714,862; 1,716,463; 1,716,990.
38 P. HATSCHEK: Kinotechnik, 11 (July 20, 1929), p. 367.
39 Licht Bild Buhne, 21 (Nov. 3, 1928), p. 16.
40 Kinotechnik, 11 (Mar. 20, 1929), p. 145.
41 Ed. Screen, 8 (Apr., 1929), p. 105.
42 Kinotechnik, 11 (Apr. 20, 1929), p. 202.
43 Ger. Pat. 470,566.
44 E. M. W. SABRING: Internal. Phot., 1 (July, 1929), p. 12.
46 R. E. FARNHAM: Amer. Cinemat., 10 (May, 1929), p. 16; also WRIGHT and EGELER: Trans. Soc. Mot. Pict. Eng., XIII, No. 38 (1929), p. 346.
46 O. K. OLSON: Amer. Cinemat., 10 (June, 1929), p. 14; also R. E. FARNHAM: Ibid., 10 (July, 1929), p. 7, and Trans. II. Eng. Soc., 23 (Dec., 1928), p. 1241.
46a Amer. Cinemat., 10 (Aug., 1929), p. 21.
47 Amer. Cinemat., 10 (Apr., 1929), p. 13.
48 Kinotechnik, 11 (Apr. 20, 1929), p. 216.
49 Internat. Phot., 1 (Sept., 1929), p. 12.
50 Licht Bild Biihne, 22 (Jan. 19, 1929), p. 20; Ibid., 22 (Feb. 2, 1929), p. 19.
51 Ex. Daily Rev. & Mot. Pict. Today, 25 (June 1, 1929), p. 6.
62 J. M. FIDLER: Amer. Cinemat., 10 (Sept., 1929), p. 33.
63 R. E. NORMAN: Amer. Cinemat., 10 (May, 1929), p. 19.
64 J. DUBRAY: Amer. Cinemat., 9 (Sept., 1928), p. 11.
55 Ger. Pat. 466,607.
56 C. H. DUNNING: Amer. Cinemat., 10 (Apr., 1929), p. 18.
57 Amer. Cinemat., 10 (Apr., 1929), p. 20.
58 Amer. Cinemat., 10 (July, 1929), p. 37.
59 F. W. SERSEN: Amer. Cinemat., 10 (July, 1929), p. 31.
60 Ger. Pat. 466,347; U. S. Pats. 1,698,178; 1,703,818; 1,715,127; 1,715,510.
61 H. CROISE: Bioscope (Brit. Film No.) (1928), p. 267.
62 Internat. Phot., 1 (Aug., 1929), p. 16.
63 Mot. Pict. News, 40 (Sept. 7, 1929), p. 908; also Ex. Herald-World, 96 (Aug. 24, 1929), p. 39.
64 Mot. Pict. Div. U. S. Dept. Com. Report (Aug. 21, 1929).
65 L. W. PHYSIOC: Internat. Phot., 1 (Sept., 1929), p. 7.
66 B. /., 76 (Mar. 15, 1929), p. 149; Can. Pat. 289,343.
67 Kinotechnik, 11 (Apr. 20, 1929), p. 208.
68 T. A. MILLER: Internat. Phot., 1 (Aug., 1929), p. 32.
69 H. BOHM: Kinotechnik, 11 (Feb. 20, 1929), p. 90; also Wireless World (Apr. 10, 1929), and Bioscope (Supp.), 78 (Feb. 27, 1929), p. VII.
70 P. HATSCHEK: Kinotechnik, 11 (Aug. 20, 1929), p. 436.
71 Amer. Cinemat., 10 (Sept., 1929), p. 16; also Filmtechnik, 5 (Apr. 27, 1929), p. 191.
72 Wireless World, 23 (Dec. 26, 1928), p. 842.
73 P. HEMARDINGUER: La Nature, No. 2814 (July 1, 1929), p. 107.
74 L. A. ELMER: Bell Lab. Record, 7 (July, 1929), p. 445.
75 P. HATSCHEK, Kinotechnik, 11 (July 5, 1929), p. 343.
7« P. HATSCHEK and E. LIHOTZKY: Kinotechnik, 11 (Mar. 20, 1929), p. 149. 77 A. KLAGES: Kinotechnik, 11 (July 20, 1929), p. 376; et seq.