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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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Herman Holterarendas välja tabelimismasina, mis kasutas õpetamiseks perfokaarte. Holteri aparaati kasutati inimeste loendamiseks Ameerika Ühendriikide rahvaloenduse jaoks. (1 gen 1906 anni – 1 apr 1906 anni)

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Data:

1 gen 1906 anni
1 apr 1906 anni
~ 3 months
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