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In the respective prefaces to the preceding volumes, the source of the material for the series was told. It may, however, be again stated that through the gener osity of metal worker it was possible to compile these books. Needless to say, as it is a well-known fact, that journal has the services of experts in the various fields it represents and accordingly it would seem no further recommenda tion is necessary for the series practical sheet metal work and demonstrated patterns.
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