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Addendum #2 to Agreement dated April 3, 1970 Re: Battery and Line Powered Residential and Commercial Fire Detectors
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United States Patent 3,731,093
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Amendment addressed to the Commissioner of Patents by Hugh Drake on behalf of Lyman Blackwell Re: Patent Application 720,745
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Letter to William Meserole, Esq. from Hugh Drake Re: Blackwell Application Serial No. 720,745
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United States Patent 3,728,615
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Letter to Paul Staby from Duane Pearsall Re:Agreement to wave the Engineering Employment Agreement
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Addendum to the Agreement between Blackwell and Statitrol Re: battery and line powered residential and commercial fire detectors
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Addendum to Agreement between Blackwell and Statitrol Re: Self-Switching Ionization-type detectors of products of combustion
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Agreement Assigning Statitrol the Rights to the Self Switching Ionization-type Detector of Products of Combustion
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Agreement Assigning the Rights to the Positive Ion Detector to Statitrol
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