IP67:

IP rating indicating means the item is resistant to dust can be placed into a body of water up to a meter deep for 30 minutes.

Maintained:

A position of a switch which remains unchanged when actuation force is removed from switch actuator. Contrast with Momentary.

IP68:

IP rating indicating that the product is resistant to dust and sealed against continuous immersion under 1 meter of water for a minimum of 30 minutes, not operated.

Make:

Indicates that a switch has completed the dynamics of closing an electrical circuit.

IP69K:

IP rating indicating the product is protected against for high-pressure, high-temperature wash-down applications. Such enclosures must not only be resistant to dust, but it must also be able to withstand high-pressure and steam cleaning.