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Expired
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George Robert Ray
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Individual
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Individual
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Publication of GB190522064ApublicationCriticalpatent/GB190522064A/en
22,064. Ray, G. R. Oct. 30. Man - hole doors. -A man-hole door 16, in connexion with a valve casing, is secured in place by a swinging bolt 19 which engages a hinged bar 17 to which the door is pivoted.
GB190522064D1905-10-301905-10-30Improvements in or connected with Valves.
ExpiredGB190522064A
(en)