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Pat. 10247426 United States, Int. Cl.22 H04L 25/02, F24D 3/02, F24D 19/10, F24H 9/12, F24H 9/20, H03K 5/08, H02M 3/07, H03K 3/0231. Boiler control comprising analog up/down timer circuit for generating variable threshold signal : Appl. N 15/446703 : Filed 01.03.2017 : Pub. 02.04.2019 : / Martin Kanner, Arthur Bauman ; Assignee Martin Kanner ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10247426/en?oq=US10247426.html (дата обращения: ДД.ММ.ГГГГ).