Need help understanding the Danish markings

What is the difference in the Dainish markings, FKF, HTK and HMAK?
And what time era what are these different markings used in and what are their significance?

If you google the terms, you should find the definitions pretty easily. See this link for example:

http://worldbayonets.com/Bayonet_Identification_Guide/Denmark/Denmark_2.html

Wolverine wrote:If you google the terms, you should find the definitions pretty easily. See this link for example:

http://worldbayonets.com/Bayonet_Identification_Guide/Denmark/Denmark_2.html

thanks