Do you mean the metal, brass, or the kinds of musical instruments called brass? The first metal alloy that was a kind of brass was probably invented about 5000 years ago. We don't have any way of knowing an exact year.
For brass Musical Instruments, the early Romans and Greeks had musical instruments made of brass, more than 2000 years ago. Again, we don't have any way to know an exact year.
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Brass has been known since pre-historic times; no records exist of who originally smelted it.
The process of smelting copper and zinc has been known since pre-historic times.
Brass makes Brass instruments for example, the Tuba, trumpet, euphonium,and trombone are ALL made of brass
The refracting telescope was invented first in the early 17th century.
No, a magnet will not stick to brass because brass is not a magnetic material. Brass is an alloy made of copper and zinc, and neither of these metals are magnetic.
No. Brass is a mixture.
Not to any brass part of the bed, brass is not magnetic.