In the old book “The German Sniper 1914-1945” by Peter R. Senich, “hap” and “kay” are listed as the manufacturer of ZF41. And Richard D. Law says in his book “Sniper Variations of the German K98k Rifle” that he could not find any example of those two makers. During my research, I have gained data of “bmj” and “emv” which are not listed in those two books but have never seen data of “hap” and “kay”. So, for the time being, I do not list those two as ZF41 manufacturers. I do not hesitate to show respect to Mr.Senich as a great forerunner, but I do not believe him just because he writes so. That leads to the myth “Kar43 is 5cm shorter than Gew43”!