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a machine capable of adding numbers and sometimes capable of performing the other arithmetic functions of subtraction, multiplication, and division: such machines are now obsolescent, having been replaced in most applications by electronic calculators.
Historical Examples

If they are to be converted to uses for which excavation is desirable, this is another item for the adding machine.
If You’re Going to Live in the Country Thomas H. Ormsbee and Richmond Huntley

“I use an adding machine,” she half whispered, and it made me chuckle.
The Million-Dollar Suitcase Alice MacGowan

One of the latest developments of the adding machine is a type that will post ledgers and statements.
The Wonder Book of Knowledge Various

I simply had to learn music; and I learned it like the adding machine.
Miss Billy Eleanor H. Porter

The new device, the adding machine, has greatly lessened office drudgery.
Business English Rose Buhlig

He is also the inventor and patentee of the Lindholm & Peterson adding machine.
Fifty Years In The Northwest William Henry Carman Folsom

There was an adding machine, two sets of files, several large cabinets with steel doors, and a desk with a typewriter on it.
A Yankee Flier Over Berlin Al Avery

He held them behind him and his fingers fairly galloped as he used them for an adding machine.
Four Little Blossoms at Oak Hill School Mabel C. Hawley

All the latest banking machinery was in operation, including the coin separator and counter and wrapper, and the adding machine.
The Soul of John Brown Stephen Graham

Having installed an adding machine, our office work could be done in half the time.
Business English Rose Buhlig

noun
a mechanical device, operated manually or electrically, for adding and often subtracting, multiplying, and dividing