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8110M is a model of fixed-body ergonomic keyboard from BTC.
The keyboard features a curious foot arrangement whose functionality is not clear.
BTC 8110M features Erase-Eaze: the left side of the space bar is set to function as backspace. The label cites US patent 5143462, for Erase-Eaze.
Rear label and membrane connections; the controller board bears a date code beginning "98"