| http://www.w3.org/ns/prov#value | - It is to be understood that the selective switching means may comprise any suitable means, including but not limited to, a microswitch, such as the microswitch commercially available from Cherry Electrical Products, Waukegan, Ill., under the trade designation Cherry DG1C-B3LA. In the preferred embodiment, the switching means comprises first 40, second 42 and third 44 microswitches, the first 40 be
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