RewriteEngine on
RewriteRule ^doppelklinge/?$ /?p=doppelklinge [L]
RewriteRule ^doppelklinge/([a-zA-Z0-9]{8})/?$ /?p=doppelklinge&c=$1 [L]
RewriteRule ^vermessung/? /?p=vermessung [L]
RewriteRule ^knochen/? /?p=knochen [L]