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From: rbowman <bowman@montana.com>
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Subject: Re: This Is a Job For - Polarizing Film ?
Date: 3 Jan 2026 01:21:48 GMT
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On Fri, 2 Jan 2026 02:56:03 -0500, c186282 wrote:

>    "Duck" was a legal brand-name. Competitors had to come up with a
>    variant.

https://www.duckbrand.com/about

'Duck' is a trademark but came well afterwards. Even 'duct' was a postwar 
use of the WWII creation.