In his reply to Bull's email, Mr Robert Svirk @YORK mentions Mr
Dohnal regarding patent from 1934. I did some digging in the Czech online
patent database. I could neither find said patent from 1934 nor anything regarding the patent number on Bull's vice. This could be the reason - from the website:
This database contains some Czech published patent applications, patents and utility models.
Ok, so some, not ALL patents are listed there.
However; After a brief search I discovered MR.
Jan Dohnal who has six registrations in this database, from 1929 until 1938.
*NOTE: All titles are computer translations from Czech..
Here is the earliest one, I included pic from the application for fun. It seems Mr. Dohnal is representing "Dobříš METAL FACTORY" here. (computer translation)
Registration Number 34815
Filing date 18.01.1929
Registration Date 10.01.1931
Applicant/Holder DOBŘÍŠSKÁ TOVÁRNA KOVOVÉHO ZBOŽÍ JAN DOHNAL
self locking hand clamp
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This one looks like addition to the hand clamp above. If you click the link you can access link to the application file .pdf and see picture.
Registration Number 34816
Filing date 18.01.1929
Title
Auxiliary device
Applicant/Holder DOBŘÍŠSKÁ TOVÁRNA KOVOVÉHO ZBOŽÍ JAN DOHNAL, XY
Registration Date 10.01.1931
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Here Mr Dohnal is solo. This shock absorber is quite an invention.
Registration Number 65356
Filing date 31.10.1935
Applicant/Holder JAN DOHNAL, XY
Registration Date 25.09.1939
Fluid shock absorber
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Here we have something familliar, and this seems to back up Mr Svirk story. It would be interesting to get translation of the application file:
Registration Number 67608
Filing date 27.09.1937
Registration Date 25.05.1940
Applicant/Holder JAN DOHNAL, XY
Save the sliding jaw in a solid body vice
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This is the last one from Mr Dohnal I could find. It is interesting to note the time-span between "filing date" and "registration date" One explanation could be the Czech patent office was closed during the war.
Registration Number 75784
Filing date 15.02.
1938
Title
Chuck for drill bits
Applicant/Holder JAN DOHNAL, XY
Inventor JAN DOHNAL, XY
Publication Date 15.04.1947
Registration Date 15.04.
1947
Status Expired document
Type Application for the author’s certificate for invention
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Searching for "vice" I also found this and the item really looks familiar. Here Mr. Dohnal is nowhere to be seen, this looks like a company name. Without understanding the application text it is anyone's guess what they are applying for here but the overall design is familiar.
Registration Number 76192
Title:"Adjusting the cap of the vise with solid leadership and ensuring the cylindrical tube matkové" (ohh yes, google translation)
Filing date 24.05.1946
Applicant/Holder ING. FR. HÖNIG & SPOL., XY