in factory / at factory

[sb70012]

Hi friends,

I checked the usage of word "factories" in dictionaries.
I saw a lot of "in factories" but I didn't see "at factories"
Are both correct? I think one is British and another is American, yes?
Have you ever heard "at factories"?

I would be happy if you clarify it to me.

Source: self made question
Many thanks.

 

[MikeNewYork]

Hi friends,

I checked the usage of word "factories" in dictionaries.
I saw a lot of "in factories" but I didn't see "at factories"
Are both correct? I think one is British and another is American, yes?
Have you ever heard "at factories"?

I would be happy if you clarify it to me.

Source: self made question
Many thanks.

Yes "at factories" is used, but "in factories" is far more common.

Click here for some uses of "at factories": https://www.google.com/search?q="at...j7&sourceid=chrome&espv=210&es_sm=93&ie=UTF-8