For chart use, James Cunningham, Son and Company 1 fabricated high-speed, very-long-life batten switches 2 with physically baby automated locations which acceptable faster operation than telephone-type batten switches. Many of their switches had the automated Boolean AND action of telephony batten switches, but added models had alone relays (one braid per crosspoint) in cast arrays, abutting the broadcast contacts to x and y buses. These closing types were agnate to abstracted relays; there was no analytic AND action congenital in. Cunningham batten switches had precious-metal contacts able of administration millivolt signals.
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