Since I started on the wholesale end at the same time DA made its appearance, I can give a general time line. 1972 CRANE GS appeared first (if you discount the DURA ACE centerpull brakes) I think it became the a part of the DA line when they put it in the felt lined box CRANE short arm appeared just after ,as I remember late72 early73 BRAKES, CRANKS , HUBS (HI&LO)HEADSETS, DOWN TUBE SHIFTERS and FRT DER made their appearance 73/74 BAREND SHIFTERS 74/75 BLACK appears BRAKE CALIPERS, HEADSETS,HUBS,CHAINRINGS and DER bodies maybe SHIFT LEVERS
I left the BUSINESS in 79 and dont remember any PEDALS or a SEAT POST being part of the line.KKT and SR being major suppliers in those areas.
I remember the 70s as being a time when the JAPANESE BIKE IND was being controlled by a few large TRADING companies in almost a FEUDAL manner . SUNTOUR was at the disadvantage because they could not completely equip a bike (I think they did try to move in that direction later)
BIKE BIZ in this era could make a good book
BOB FREITAS
MILL VALLEY, CA