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An experimental magnetic bubble mass memory design is reported. The goal of this project has been to examine the technical feasibility of organizing a multiplicity of chips into a modular design and to learn some of the problems. The module consists of four ceramic substrates, each of which can mount from 1 to 14 chips of up to 20 kbit capacity. 1 to 4 of these populated substrates can be placed into a common drive coil-bias field magnet assembly. The module organization and timing is described and data obtained from the operation of 20 kbit chips at 112 kHz rotating field is given.