Maybe they refer to the spider and bolts, although its quite possible they did a one piece crank BB they made BBs and lots of one piece cranks , so why they wouldnt do a full house?
Although the same group of companys were interlaced with each other not sure but Tioga , Tange , sugino were all part of the japanese cycle co , so maybe tange did the one piece , and sugino didnt bother
Its hard to find out unless you speak japanese , i did try to get some history but was stuck after i got a pidgeon english email from them
well it does say seat pole , so maybe it came with a flag