===Petersen Type M===
{{Type| Similar to type K, but shorter, and they have the widest part of the blade further towards the tip than type K's. These date mostly to the C11th. [PETERSEN 1919]Fuglesang has redefined the difference between types K and M by measuring the distance from the mouth of the socket to the widest part of the blade (the shoulder). <br>:Type K: 1:3 to 1:3.8 <br>:Type K/M: 1:2.4 to 1:3 <br>:Type M: 1:1.6 to 1:2.4
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