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Ernest Wilmot Guptill fonds File Patents
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Correspondence re. E.W. Guptill's award/patent disputes
Correspondence re. E.W. Guptill's award/patent disputes
Correspondence re. E.W. Guptill's patent applications
Correspondence re. E.W. Guptill's patent applications
Correspondence with Commissioner of Patents re. E.W. Guptill's directive antennas for microwaves patents
Correspondence with Commissioner of Patents re. E.W. Guptill's directive antennas for microwaves patents