Category:807 (vacuum tube)

**807**
	power beam tetrode, made worldwide under dozens of alternative names
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	Wikipedia
Instance of	vacuum tube model;
Subclass of	beam tetrode;
Developer	RCA Corporation;
Inception	1936 (announcement); 1937 (manufacturing);
Authority file
	Q4644389;
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Subcategories

This category has only the following subcategory.

The following 3 files are in this category, out of 3 total.