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Updated March 6, 2007 - February 12, 2011

Wisconsin - 941.24. Possession of switchblade knife. (1)
  Whoever manufactures, sells or offers to sell, transports,
  purchases, possesses or goes armed with any knife having a
  blade which opens by pressing a button, spring or other
  device in the handle or by gravity or by a thrust or
  movement is guilty of a Class A misdemeanor...
[Note: the wording of this statute is different from all other state
  switchblade statutes.]

Wisconsin - 941.23 Carrying concealed weapon.
 Any person except a peace officer who goes armed with a
 concealed and dangerous weapon is guilty of a Class A

Wisconsin Case Law:

To "go armed" does not require going anywhere. The elements
for a violation of s. 941.23 are: 1) a dangerous weapon is on the
defendant's person or within reach; 2) the defendant is aware of
the weapon's presence; and 3) the weapon is hidden.
State v. Keith, 175 Wis. 2d 75, 498 N.W.2d 865 (Ct. App. 1993).

Judges are not peace officers authorized to carry concealed weapons.  
69 Atty. Gen. 66.


City of Milwaukee Ordinance 105-34, provides, in relevant part:

Carrying Dangerous Weapons.  
  1. PROHIBITED. a. It shall be unlawful for any person except a
peace officer to go armed with a concealed and dangerous weapon
within the city of Milwaukee.
  2. DEFINITIONS.  For the purposes of this section:
  a. "Dangerous Weapon" means any device designed as a weapon
and capable of producing death or great bodily harm, ... or any other
device or instrumentality which, in the manner it is used or intended
to be used, is calculated or likely to produce death or great bodily harm.  
The following are dangerous per se: ... any other knife having a blade
3 inches or longer.  Instruments not herein specifically enumerated are
none the less considered weapons when they fall within the terms of
this definition.

Note: "Instruments not herein specifically enumerated" can include smaller knives than 3 inches.