| 摘要 |
A knife which has a body with a blade head at one end and roller at the other end. The blade head also has a planar first guide cheek and planar second guide cheek. positioned at an angle, alpha relative to the blade which is received between the first and second guide cheeks. The knife also has a device for urging the blade between a retracted position and an extended position. The roller is made of a right wheel half and a left wheel half such that the roller made of two halves in intimate contact with each other.
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