Links to some 1930s machine design books

Links to some 1930s machine design books:
<http://www.opensourcemachinetools.org/archive-manuals/Ingenious_Mechanisms_Vol.1_Jones_1930.pdf <http://www.opensourcemachinetools.org/archive-manuals/Ingenious_Mechanisms_Vol.2_Jones_1930.pdf <http://www.opensourcemachinetools.org/archive-manuals/Ingenious_Mechanisms_Vol.3_Jones_1930.pdf <http://www.opensourcemachinetools.org/archive-manuals/Ingenious_Mechanisms_Vol.4_Jones_1930.pdf

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