More completion:

<http://patimg2.uspto.gov/.piw? 
docid=US000644695&PageNum=1&&IDKey=1BFAD7E0A715&HomeUrl=http:// 
patft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1%2526Sect2=HITOFF% 
2526d=PALL%2526p=1%2526u=%25252Fnetahtml%25252FPTO%25252Fsrchnum.htm% 
2526r=1%2526f=G%2526l=50%2526s1=0644,695.PN.%2526OS=PN/0644,695% 
2526RS=PN/0644,695>

The drawings are indeed very good!

Only took me this long to find it given the number...

<L>
Lou Judson
Intuitive Audio
415-883-2689

On Oct 15, 2009, at 1:54 PM, George Brock-Nannestad wrote:

> Hello, just completing the references:
>
> British Patent 3393/1901 for a corrugated diaphragm
> British Patent 9418/1899 for a violin and similar stringed instruments
> US Patent 644,695 is the corresponding US patent
>
> The drawings in the earliest patents are very good.