Abstract: An electric switch having two pushbuttons for rocking a pivotal actuator alternately in opposite directions for alternately closing double-throw contacts. The pivotal actuator is snap-in assembled to a switch frame which is snap-in assembled to a switch base or housing that supports the contacts. The two pushbuttons are alike and are guided in their vertical reciprocal motion by the switch frame and by one another. To allow use of minimum height pushbuttons while having ample finger-engaging surface, the pushbuttons are provided with like but complementary guiding structures integrally molded thereon to guide one another in their relative vertically reciprocal movements without binding or "window-locking" with respect to one another or the switch frame.

Abstract: Disclosed is a radio capsule having an electrode structure for measuring the concentration of an ionic species in an ion containing solution. A thin film conductive electrode is strongly bonded to the inner surface of a thin cylindrically shaped membrane of glass sensitive to the ionic species. A conductive lead wire makes electrical contact with the electrode. A mass of non-conductive reinforcing backing material having a thermal coefficient of expansion greater than that of the membrane strongly adheres to the conductive electrode and the membrane. The backing material is cured or solidified at a temperature sufficiently higher than that at which the electrode structure is to be used so that contraction of the backing material during curing places the membrane in a state of compression, thereby strengthening the same.

Abstract: An electric switch having two pushbuttons for rocking a pivotal actuator alternately in opposite directions for alternately closing double-throw contacts. The pivotal actuator is snap-in assembled to a switch frame which is snap-in assembled to a switch base or housing that supports the contacts. The two pushbuttons are alike and are guided in their vertical reciprocal motion by the switch frame and by one another. To allow use of minimum height pushbuttons while having ample finger-engaging surface, the pushbuttons are provided with like but complementary guiding structures integrally molded thereon to guide one another in their relative vertically reciprocal movements without binding or "window-locking" with respect to one another or the switch frame.