This redirect is within the scope of the Aviation WikiProject. If you would like to participate, please visit the project page, where you can join the project and see lists of open tasks and task forces. To use this banner, please see the full instructions.AviationWikipedia:WikiProject AviationTemplate:WikiProject Aviationaviation articles
Latest comment: 1 year ago1 comment1 person in discussion
More than a century ago there were similar devices called "motorman's friends'' for operators of (urban?) streetcars. I believe that they drained to the exterior of the streetcar. I don't know whether there were precursors to such devices. DCDuring (talk) 15:41, 6 December 2022 (UTC)Reply