SOME REMARKS ON THE BELL NUMBERS
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An interior deflector covering the opening communicating to the manifold and bag assembly in a gas generating device.
[1] G. Rota. The Number of Partitions of a Set , 1964 .
[2] Shimon Even,et al. On the Number of Partitionings of a Set of n Distinct Objects , 1962 .
[3] John Riordan,et al. Introduction to Combinatorial Analysis , 1959 .