Abstract: The present invention discloses a novel, labelled vitamin D.sub.3 derivative in which hydrogen atoms on the skeleton portion, i.e. 6- and 19-positions, are substituted with a deuterium atom or a tritium atom, as well as a novel production process of the labelled vitamin D.sub.3 derivative carried out by way of sulfur dioxide addition reaction of a vitamin D.sub.3 derivative. The labelled portion of the novel vitamin D.sub.3 is resistant against in vivo metabolism and make a long period tracing of its pharmacodynamics in a living body possible.

Abstract: A bobbin conveying device in which a spinning bobbin preparation station and a winder are connected to each other by a first vertical conveying line and a second vertical conveying line, and each of the conveying lines is constituted of a single endless belt. A spinning bobbin in inserted and carried on a bobbin transporting medium and the spinning bobbin is conveyed on the endless belt being carried on the transporting medium.