| http://www.w3.org/ns/prov#value | - t least a portion of one side thereof, said coating constituting a reference electrode, said frame and said diaphragm defining a chamber, and (iii) means in said chamber for transmitting pressure applied to said frame to said diaphragm, (iv) said first sheet of flexible transparent insulating material also including a conductive coating serving as a guard electrode. 31.
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