Abstract  Description  Claims  Drawing  Cited references 

US4099852A   [0006] 
US2021055501A1   [0006] 
US2006001886A1   [0006] 
US9958710B1   [0019] 
US9958711B1   [0019] 
US10466516B2   [0019] 
US10509245B2   [0019] 
US10495943B2   [0019] 
US10754223B2   [0019]