To heat the ingredients.
There is nothing on Google about "aspirin coal." It is possible that you saw the words together on a list of ingredients, such as "aspirin, coal tar...etc." but there would have been a comma between "aspirin" and "coal tar," as they are two different things.
coal
coal
Aspirin used as a prophylactic treatment for DVT condition; not used as a primary treatment.
Cortal is basically aspirin and is used for headaches and fevers and mild pain. Neither aspirin or Cortal can be used for abortion.
Aspirin can be used as a pain reducer. It is also used as treatment for a heart attack.
aspirin
How did they used to coal mine
It's the type (brand) of aspirin with the blue cap.
For heart attack. 81 mg of aspirin is used for prevention of clotting and therefore strokes or heart attacks.
coal is used for heat
The rock in question is oil shale, from which aspirin, nylon, and perfume can be obtained as by-products through a process called retorting. Oil shale is heated to release kerogen, a precursor to oil, which can then be further processed to produce various products including aspirin, nylon, and perfume.