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• Newton elaborated (or worked out) his own theory of gravitation.

• In the second phase Kepler set up a theory for the longitudes of Mars.

• When steel-making techniques were discovered ...

• Several hardness scales have been developed.

• This technique was developed (or devised, or worked out, or evolved) originally for metallurgy.

• A tentative hypothesis was devised.

• To draw up (or elaborate, or develop, or work out, or map) a plan (or a programme), ...

• We formulate special compositions for ceramic bodies.

• We are working up techniques for warm forging.