Archived posting to the Leica Users Group, 1999/11/29

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Subject: [Leica]Ultrasonic focusing for Pradovit....
From: "Dan S" <dstate1@hotmail.com>
Date: Mon, 29 Nov 1999 16:27:19 GMT
 
And now for something completely different.

In searching the attic of my family home I came upon a bizarre piece of 
1950's Leica technology.

Two complete ultrasonic focusing kits for Leica Pradovit projectors, 
including the letter from leica describing their use.  The sound bulbs and 
all accessories are included, and they appear to have never been used.

Has anybody seen these things before?

Are they worth anything?

Thanks for any advice
Dan
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