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QO Tandem breaker with push-in connections 1960-1961
QO Tandem was originally introduced with push-in connections in 1960, then the push-in connection was dropped in 1962. No catalog number changes to the product when this change occurred.
QO Tandem QO1515 and QO2020 were introduced with push-in connections in the 1960 digest with availability to be announced in June 1960. The push-in connections were also advertised in the 1961 digest, but not in 1962. I am assuming at this point that in 1962 the push-in connections were changed to a screw connection that we see today.