Abstract: A fishfinder data display device is provided. The display device includes a memory for storing fishfinder data obtained by a fishfinder detecting underwater and a location where the fishfinder data is acquired so as to associate the fishfinder data with the location, a display unit for displaying an image created based on the fishfinder data, and a controller, when an operator performs a specifying operation to a predetermined part of the image displayed by the display unit, for reading the location corresponding to the fishfinder data based on the specified predetermined part of the image from the memory, and causing an autopilot device to execute an autopilot operation with the location as a destination.

Abstract: In a rolling bearing in which at least one member of an inner race, outer race and rolling elements is made of an alloy steel containing 0.2 to 1.0 wt % of C, 3.0 to 14.0 wt % of Cr and 0.8 to 3.0 wt % of V, the balance being Fe, the member being carburized or carbonitrided, followed by hardening and tempering to secure that the surface carbon concentration C% and the concentrations Cr%+V% of Cr and V satisfy a relationship of C%.ltoreq.0.13 (Cr%+V%)+1.10 and that carbides existing on a surface of the member have an area fraction of 15 to 50%, the rolling bearing has an extending service life even if it is used under lubrication in the presence of foreign matter and exhibits superior wear resistance to be hard to wear even if there occurs a breakage of oil film.

Abstract: An object of this invention is to provide a rolling bearing which is long enough in serve life even when it is applied with a lubricant mixed with foreign matters, simply by quenching or by carbonitriding it for a short period of time, and which can be formed at a relatively low manufacturing cost. A rolling bearing is formed as follows: The quantities of elements such as C, Si, Mn, Cr and Mo forming a bearing alloy steel, and the quantity of retained austenite are adjusted to be in predetermined ranges, and the steel is quenched and tempered or carbonitrided so that its hardness is in the following range:-2.2.times.(.gamma..sub.R vol %)+810.ltoreq.Hv.ltoreq.-2.2.times.(.gamma..sub.

Abstract: An automatic web roll changing device is adapted to automatically and continuously supply web rolls to a web supply-connection apparatus on which are replaceably mounted two web rolls from which webs are alternately and continuously drawn out and which connects the trailing end portion of the preceding web to the leading end portion of the following web. This device includes a rotary arm pivoted to the web supply-connection apparatus having, at both ends, hubs carrying the above-mentioned two web rolls, and a web roll storage-mounting unit provided opposite to the web supply-connection apparatus. The web supply-connection apparatus has a rotary head which is rotatable about a vertical axis. From the rotary head horizontally extend a plurality of web roll storing shafts for holding a plurality of web rolls so as to be slidable axially of the shafts. The web rolls on the storing shafts are moved toward the distal ends of the web roll storing shaft by driving units so as to be mounted on the hubs.