Abstract: A small-sized highly accurate gas sensor, which is excellent in its reliability of electric connections between contacts and fixtures while being freed from any damage, includes a base member; a detecting unit mounted on the base member for detecting a gas concentration; electrodes mounted on the detecting unit; cylindrical contacts buried integrally in an end portion of the base member; and electric leads interposed between the cylindrical contacts and the electrodes. Contacting fixtures for external lead wires are fitted in and contact the cylindrical contacts so that they are connected to the cylindrical contacts.

Abstract: A hanger conveyance for the transport of left-hand and right-hand automobile door assemblies from and back to a loading site through a door fitting station and then through an unloading site, which hanger has first and second door supports for the support of the door assemblies generally in parallel relation to each other. The door assemblies removed from an automobile body structure are loaded onto the respective first and second supports at the loading site and are then transported towards the door fitting station with the left-hand and right-hand door assemblies confronting first and second directions opposite to each other, respectively. At the door fitting station, the hanger is turned 180.degree. about a vertical axis to render the left-hand and right-hand door assemblies to confront the second and first directions, respectively, after one of the door assemblies has been tooled up from one side and is again turned 180.degree.