| http://www.w3.org/ns/prov#value | - In the case of such uses as research, development, and maintenance in such areas as internal combustion engines or electric ignition, electric welding, and electric lighting, such as mentioned above, circuitry of the type shown in FIG. 2 may be employed up to the terminal 47, with and without circuitry of the type shown in FIGS. 4, 5 and 6.
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