Addendum # 2 to the Agreement dated April 3, 1970 regarding battery and line powered residential and commercial fire detectors which include a battery failure circuit and signal and/or a duo centril ion chamber configuration, specifically discussing Blackwell's right to fees.
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(1976). Addendum #2 to Agreement dated April 3, 1970 Re: Battery and Line Powered Residential and Commercial Fire Detectors. .
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