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https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=3618&L=0
Comptometer 1. Modell
comptometermodell
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=14346&L=0
Comptograph 1. Modell (Comptometer)
modellcomptometer
https://books.google.com/ngrams/graph?content=comptometer%2Carithmometer%2Ccalculator%2Ccalculating+machine&case_insensitive=on&year_start=1700&year_end=1970&corpus=5&smoothing=5&share=
Google Ngram Viewer: comptometer,arithmometer,calculator,calculating machine
Google Books Ngram Viewer
google ngramviewercomptometercalculatorcalculating
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=77&L=0
Comptometer JS
comptometerjs
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=2734&L=0
Comptometer 992
comptometer
https://en.wikisource.org/wiki/Page:Comptometer_News_1.1.djvu/29
Page:Comptometer News 1.1.djvu/29 - Wikisource, the free online library
the freecomptometernewsdjvu
https://en.wikisource.org/wiki/Page:Comptometer_News_1.1.djvu/21
Page:Comptometer News 1.1.djvu/21 - Wikisource, the free online library
the freecomptometernewsdjvu
https://www.arithmeum.uni-bonn.de/en/collection/calculating-in-olden-times/object.html?tx_arithinventory%5Bobject%5D=1048&L=2
Comptometer H
comptometerh
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=285&L=0
Comptometer Macaroni-Box
comptometermacaronibox
https://openresearch-repository.anu.edu.au/entities/anuarchivesitem/f19a3ef8-c698-4bd1-a9ef-775f59a90902/full
Staff Comptometer
staffcomptometer
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=14316&L=0
Comptometer B
comptometerb
https://en.wikisource.org/wiki/Index:Comptometer_News_1.3.djvu
Index:Comptometer News 1.3.djvu - Wikisource, the free online library
the freeindexcomptometernews
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=13972&L=0
Comptometer A
comptometer
https://en.wikisource.org/wiki/Page:Comptometer_News_1.1.djvu/28
Page:Comptometer News 1.1.djvu/28 - Wikisource, the free online library
the freecomptometernewsdjvu
https://badonoer.blogspot.com/2023/12/not-made-by-felt-tarrant-then-not.html
Backspace does not erase: Not made by Felt & Tarrant, then not a Comptometer
In 1920 the company behind the Comptometer published an updated edition of their 1914 book " Applied Mechanical Arithmetic as practiced on t...
does notmade bybackspaceerase
https://books.google.com/ngrams/graph?content=comptometer%2Carithmometer%2Ccalculator%2Ccalculating+machine&year_start=1700&year_end=2019&corpus=26&smoothing=5&case_insensitive=true
Google Ngram Viewer: comptometer,arithmometer,calculator,calculating machine
Google Books Ngram Viewer
google ngramviewercomptometercalculatorcalculating
https://www.arithmeum.uni-bonn.de/en/collection/calculating-in-olden-times/object.html?tx_arithinventory%5Bobject%5D=13972&L=2
Comptometer A
comptometer
https://www.arithmeum.uni-bonn.de/en/collection/calculating-in-olden-times/object.html?tx_arithinventory%5Bobject%5D=77&L=2
Comptometer JS
comptometerjs
https://www.arithmeum.uni-bonn.de/sammlungen/rechnen-einst/objekt.html?tx_arithinventory%5Bobject%5D=1446&L=0
Comptometer J
comptometerj
https://en.wikisource.org/wiki/Page:Comptometer_News_1.1.djvu/12
Page:Comptometer News 1.1.djvu/12 - Wikisource, the free online library
the freecomptometernewsdjvu