Yep- there are airsoft versions of the Mauser 98K, licensed by Mauser- gas and spring versions. Google search for Mauser 98 airsoft. Hobbytron has a spring version for $119.
Well if the spring is broken, take it to your local airsoft store and ask them to replace it for you. If you have experience with fixing airsoft guns you can just buy a compatible spring and install it you else, but it looks like you don't since your asking. If it is a cheaper airsoft gun unlike a 100 dollars or above weapon purchased form an airsoft retailer, dont bother fixing it. If its not do what I said above.
Mauser ended in 2004.
Daniel Mauser's birth name is Daniel Conner Mauser.
No- the 7x57 was developed separately, in 1892 by Paul Mauser. The 8mm Mauser (actually the 7.92 Mauser, but every calls it the 8mm) was developed by a government board.
Wilhelm & Paul Mauser. If you Google Mauser the 3rd item "WIKI" will give you the history.
Siegfried Mauser was born in 1954.
No
Mauser was created on 1874-05-23.
You will need to contact Mauser.
Paul Mauser was born on 1838-06-27.
Robert Ball's book of the Mauser is a place to start