What family of instruments did NOT exist when Curt Sachs and Erik von Hornbostel invented their system for classifying musical instruments (and had to be added later)?

Ibelieve the answer is the renaissance

Material safety data sheetswhen working with any type of chemical the should be posted in a conspicuous place in the work areamsdsif a material does pose a health hazard teachers shouldobserve appropriate precautions when they or their students handle the materialmsds are available fromproduct manufacturesmsds sheets must beavailable in shop/science classes at all times

The answer is jean-michel basquiat