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Discover LudwigThe phrase "before or at" is correct and can be used in written English
It is commonly used to indicate a time frame within which something should happen or be done. Example: Please submit your report before or at 5 pm tomorrow.
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I have less courage than before, or at least less willingness to test it.
Not quite palaeolithic then, but late neolithic – still stone age, and before, or at the very dawn of agriculture.
I've told this story before, or, at least part of it.
But we're stubborn, gone where no one's really looked before, or at least in almost a century".
The study sites tested the first panel just before or at study initiation.
The peptides were added either 45 minutes before, or at the time of cytokine stimulation.
Cells were seeded into 12-well or 6-well plates and transfection was performed shortly before or at 70% confluence.
Effusion mesothelin was elevated in 115 of the 174 effusions (66%) collected before or at the time of diagnosis.
Real negotiations never even took place, before or at Cancún.
The NUS has said it intends to "decapitate" either before or at the next election.
It must be recorded by the buyer's title company before or at the closing.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com