 Vester's design allowed the viewing tube to be removed and reused once death was assured.Count Michel de Karnice-Karnicki, a chamberlain to the Tsar of Russia, patented his own safety coffin, called Le Karnice, in 1897 and demonstrated it at the Sorbonne the following year.His design detected movement in the coffin and opened a tube to supply air while simultaneously raising a flag and ringing a bell.