List of holders : Bentley's second phrase code : including all names registered between 7th September, 1934 and 4th January, 1937 only : supplementary /
Bentley, E. L.,compiler.
Cover title.
"4th January, 1937"--Cover.
List (No. 6)
Supplement to 5.
"As notified since List No. 5 and before 4th January, 1937"--Page [3]
"This list contains the names only of such firms as have sent in registration cards or have definitely advised us that they are actual holders of the code."
Cipher and telegraph codes.