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Diamond Vacuum Products Corporation

Diamond Vacuum Products Corporation, 4049 Diversey Avenue, Chicago, IL, USA
d/b/a Shieldplate Tube Corp., 208 South La Salle Street, Chicago, IL, USA {by Nov-1928}



First seen: 01-Nov-1924
Last seen: 01-Sep-1930

Brand(s): Diatron, Shieldplate

Diamond Vacuum Products Corp registered their 'Diatron' brand 14-Jul-1925, claiming use since 1-Nov-1924


[1]

Diamond Vacuum Products history will go here. An interesting note is Diamond Vacuum spinning off the Shieldplate Tube Co. around 1927 to sell very early screen grid tubes.

Diatron variants:

 
D
I
A
T
R
O
N
201-A
1
Tube
{v1} Globe (s-14), tall engraved bakelite base, tipless, small diamond envelope label


Diatron 201A var1  
Diatron var 1
 
 
 
 

{v1} "Diatron" "201A" with Sm. red envelope label.


D
I
A
T
R
O
N
201-A
2
Tube
{v1} Globe (s-14), tall engraved bakelite base, tipless, large foil envelope label


Diatron var2
Diatron var 2
 
 
 
Diatron base view

{v2} "Diatron" "201A" with Lg foil envelope label.

 



Huntington Herald, 22-Oct-1926, pg. 4[5]
Pittsburgh Press, 14-Aug-1927, pg. 53[6]
Dayton Daily News, 17-Nov-1927, pg. 13[7]
Pittsburgh Press, 16-Sep-1927, pg. 46[8]
Radio News, Oct 1928, pg. 397[9]

Bibliography references:
  1. Official Gazette US Patent Office, 14-Jul-1925, vol. 336, pg. 298. From Hathitrust.org. Retrieved 02-May-2019 * 
  2. Chicago Tribune, 08-Nov-1925, pg. 59. From Newspapers.com. Retrieved 23-Dec-2018. !
  3. Quad City Times, 19-Dec-1926, pg. 25. From Newspapers.com. Retrieved 23-Dec-2018. !
  4. Chicago Tribune, 26-Feb-1926, pg. 50. From Newspapers.com. Retrieved 23-Dec-2018. !
  5. Huntington Herald, 22-Oct-1926, pg. 4. From Newspapers.com. Retrieved 23-Dec-2018. !
  6. Pittsburgh Press, 14-Aug-1927, pg. 53. From Newspapers.com. Retrieved 23-Dec-2018. !
  7. Dayton Daily News, 17-Nov-1927, pg. 13. From Newspapers.com. Retrieved 23-Dec-2018. !
  8. Pittsburgh Press, 16-Sep-1927, pg. 46. From Newspapers.com. Retrieved 23-Dec-2018. !
  9. Radio News, Oct 1928, pg. 397. From Newspapers.com. Retrieved 23-Dec-2018. !

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