Honeywell T87

Honeywell T87 Round Thermostat wani ma'aunin zafi ne da Honeywell International, Inc. ta fara kera a shekarar 1953.  Henry Dreyfuss ya tsara ma'aunin zafi bisa ga wani ra'ayi da injiniyan Honeywell Carl Kronmiller ya gabatar. 

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 "Honeywell Round Thermostat" a cikin MNopedia, Minnesota Encyclopedia