What invention is this?
air conditioner
What invention is this?
e-book
What invention is this?
fan
What invention is this?
landline phone
What invention is this?
laundry sink
What invention is this?
manuscript
What invention is this?
printed book
What invention is this?
scrub board
What invention is this?
smartphone
What invention is this?
telegraph
What invention is this?
washing machine
