1
Published: 1937
Superior document: Bell telephone system B-1039
2
Published: 1931
Superior document: Bell telephone system B-605
3
Published: 1937
Superior document: Bell telephone system B-1027
4
Published: 1935
Superior document: Bell telephone system B-855
5
Published: 1936
Superior document: Bell telephone system B-966
6
Published: 1934
Superior document: Bell telephone system B-839
7
8
Published: 1912
9