Where does this come from, and can I check it?

Electromechanical rotary stepping switches allowed callers to dial numbers without human operators. The figure is taken from IEEE History Center, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the Technology shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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Almon Strowger patented the first automatic telephone exchange switch in 1891

Electromechanical rotary stepping switches allowed callers to dial numbers without human operators

Kansas undertaker Almon Strowger invented the electromechanical rotary switch in 1889 after suspecting telephone operators were diverting business calls to a rival undertaker. His patented stepping switch responded directly to pulses generated by rotary telephone dials. The Strowger switch automated telephone exchanges globally for nearly a century before digital electronic switching.

Strowger switches TMW.agr — ArnoldReinhold · CC BY-SA 4.0 · licence · source

Where this comes from

IEEE History Center

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Tags: telecoms, switching, telephone

Almon Strowger patented the first automatic telephone exchange switch in 1891: the short answers

Where does this come from, and can I check it?: Electromechanical rotary stepping switches allowed callers to dial numbers without human operators. The figure is taken from IEEE History Center, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a technology fact?: Yes. It sits on the Technology shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.