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omnigraph

[om-ni-graf, -grahf] /ˈɒm nɪˌgræf, -ˌgrɑf/
noun
1.
a device for converting Morse Code signals that are punched on a tape into audio signals, used in the training of telegraph operators.
Origin
1860-1865
1860-65; omni- + -graph
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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