A wiper motor, a relay, two switches, a piston, an elbow pipe, a bulb, a vacuum cleaner bag, a tank and a car battery.
So two Kenyans from Thika, a town not far from Kenya's capital Nairobi, created a lung ventilator for the Coronavirus emergency.
Paul Kariuki and Samuel Kairu, these are the names of two shopkeepers, certainly not scientists or engineers, took four days to create something that could be a vital resource for a country struggling with the exponential growth of cases of Covid-19 positivity and the difficulty of finding on the world market respirators of all kinds.
The two Kenyans assembled the ventilator after collecting 98,000 shillings (less than 1000 euros) and saving 12,000 to test the prototype. After the green light, they will be able to raise more funds to start 3D printing to produce more specimens.
Of course, bureaucracy and science will be able to extend the time by having to establish the goodness of practical application on patients suffering from respiratory syndromes, but a good step has been taken by these enterprising young people.
Paul, who ran a DVD sales and rental shop that recently closed due to the pandemic, asked his friend Samuel for the ticket money to join him in the town of Ruiru and start making the prototype. The innovation is perfectly suited to be used throughout the country because it does not require electricity and is based on a battery for power supply.  
A ventilator is a machine that provides mechanical ventilation by moving air in and out of the lungs so that a patient who is physically unable to breathe independently can breathe.
In a video posted on Facebook, Kariuki explains how the ventilator works:
"The switch powers the wiper motor, as you can see there's a piston going down and pressing the bag. Then there is the inner bulb that illuminates the bag - explains the inventor - The motor can be adjusted and the speed can be increased as needed. You can also put a timer or an intermittent that can regulate the oxygen supply. We are trying to imitate breathing, we have not yet obtained a doctor's approval and are happy to have it inspected.
Paul told the media that it was the lack of fans that prompted them to propose innovation: "In the fight against Covid-19, we have to be inventive because the world is currently facing a shortage of fans," he said, "before we are overwhelmed by the virus, we have to make fans, so this is the first locally assembled fan.
Now we need to figure out how long it will take the two of them to see their invention approved. A thorough test could take months to pass. But at least locally, you could speed things up and make a few exceptions by testing it "in the field".