The invention of the refrigerator would fall under which category?

Which category does the invention of the bicycle belong to?

The invention of the Band-Aid would be classified under:

In which category would you place the invention of the microwave oven?

The invention of the compass falls under which category?

Which category does the invention of the toothbrush belong to?

The invention of the television would be classified under:

In which category would you place the invention of the airplane?

The invention of the smoke detector belongs to which category?

Which category does the invention of the can opener fall under?

The invention of the internet would be classified as:

In which category would you place the invention of the seatbelt?

The invention of the washing machine belongs to which category?

Which category does the invention of the pencil fall under?

The invention of the lightbulb would be classified as:

In which category would you place the invention of the stethoscope?

The invention of the calculator belongs to which category?

Which category does the invention of the water filter belong to?

The invention of the camera would be classified under: