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sadbrewer
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12 hours ago, sadbrewer said:

An expalnation from 1921

 

Snap 2021-10-26 at 11.14.56.png

 

I was about to ask you the dates of the newspaper articles sadbrewer, but you've beaten me to it.

 

I'd also wondered if William Mitchell might have patented his invention, so the 1912 date in this 1921 article set me looking at my photocopies of Patent Abridgements (I spent a very useful day in the British Library, some 25 years ago, scouring through their Patent Abridgements 1859-1929 - looking for concertina-related patents), but I discovered that his Oct. 26 1912 Patent #24,523 was for a rather different model:

 IMG_20211026_0001.jpg

 

It seems the instrument that was sold at auction in 2011 conforms more to the descriptions given in his subsequent patents.

 

Aug. 5 1925 Patent #259,703;

 

IMG_20211026_0002.jpg

 

July 8 1926 #260,199;

 

IMG_20211026_0003.jpg

 

And April 3 1930 #338,094:

 

IMG_20211026_0004.jpg

 

Edited by Stephen Chambers
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On 10/26/2021 at 7:53 PM, Stephen Chambers said:

 

I was about to ask you the dates of the newspaper articles sadbrewer, but you've beaten me to it.

 

I'd also wondered if William Mitchell might have patented his invention, so the 1912 date in this 1921 article set me looking at my photocopies of Patent Abridgements (I spent a very useful day in the British Library, some 25 years ago, scouring through their Patent Abridgements 1859-1929 - looking for concertina-related patents), but I discovered that his Oct. 26 1912 Patent #24,523 was for a rather different model:

 IMG_20211026_0001.jpg

 

It seems the instrument that was sold at auction in 2011 conforms more to the descriptions given in his subsequent patents.

 

Aug. 5 1925 Patent #259,703;

 

IMG_20211026_0002.jpg

 

July 8 1926 #260,199;

 

IMG_20211026_0003.jpg

 

And April 3 1930 #338,094:

 

IMG_20211026_0004.jpg

 

 

Just to follow this up Stephen, an article written a few years later said the initial patent lapsed in 1916.

  I'll post the article asap.

Andy

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