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Expired
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James Hunter Gray
John Gray
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Individual
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Individual
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Publication of GB190202126ApublicationCriticalpatent/GB190202126A/en
2126. Gray, J. H., and Gray, J. Jan. 27. Drawings to Specification. Indicating movements of trains.-An audible or visible signalling-device for indicating when a given maximum speed has been obtained may be actuated by a local electric relay circuit, which is closed by the pointer of the speed-indicating mechanism.
GB190202126D1902-01-271902-01-27Improvements in Speed and Distance Measurers and Governing Devices.
ExpiredGB190202126A
(en)