I think you will find the slides received from Inland were type 3 slides. It looks like IBM received about 25,000 of them late summer and up to December 1943. IBM did not start using the type 4 slide...
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I think you will find the slides received from Inland were type 3 slides. It looks like IBM received about 25,000 of them late summer and up to December 1943. IBM did not start using the type 4 slide...
The parts your asking about are serial number dependent as to which is correct time frame wise. Photos will help a lot.