Abstract: A method and a device to prevent unauthorized use of combustion engine driven vehicles, ships, equipment, as well as engines only, including the steps to remove at least one spark plug, to attach a device having an externally threaded part as replacement for the removed spark plug(s), said part having an embracing outside member, which by means of a locking mechanism can be brought into a freely rotatable state in relation to the threaded member, thus preventing removal of same, or, alternatively, bring said members into an interlocked relationship, thus enabling the device to be attached or removed from the engine.

Abstract: In order to be able to use a standard windscreen wiper switch with a biased open contact for selecting flick wipe or intermittent wipe operation the control circuit includes a flip-flop which is set when the contact is closed, but is reset by a timing circuit if the contact is held closed for more than a predetermined time. The output of the flip-flop controls a timer i.c. which in turn intermittently energizes the wiper system while the flip-flop remains set.

Abstract: The proposed collector incorporates a chamber and an auxiliary compartment; located on the bottom of said chamber is a screen conveyer for images to lay eggs thereon, said conveyer being driven by drive shafts located in the auxiliary compartment; apart from said shafts the compartment accommodates also brushes adapted for removing eggs from the conveyer screens, containers for taken-off eggs, a bath with washing liquid for cleaning the screen conveyer, a heater fan for drying the conveyer upon its having been cleaned by washing, and tensioning means which are adapted for equalizing the tension of the conveyer screens.