THE Keller Automatic Tool Room Machine, for which Alfred Herbert, Ltd., are the agents in this country, is an unusually powerful milling machine, operated by a simple electrical control. By means of this control the shape of a master is reproduced automatically by the machine. The job may be either profiling in two dimensions, or a solid form requiring three dimension cutting. In each case, a tracer passes over the master form, and the cutter duplicates its path precisely.
(1936), "A Useful Tool‐Room Adjunct: An Automatic Duplicating Miller for Production, with Uses also in the Experimental Shop", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 4, pp. 113-113. https://doi.org/10.1108/eb030036
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