electric switches to control the cooling of electronic vacuum tubes

'control':4 'cool':6 'electr':1 'electron':8 'switch':2 'tube':10 'vacuum':9

electric motors in fans used with machines to cool electronic vacuum tubes

'cool':9 'electr':1 'electron':10 'fan':4 'machin':7 'motor':2 'tube':12 'use':5 'vacuum':11

electric apparatus for cooling electronic vacuum tubes consisting of blowers and fans, and structural parts for the said blowers and fans, all sold as a unit

'apparatus':2 'blower':10,19 'consist':8 'cool':4 'electr':1 'electron':5 'fan':12,21 'part':15 'said':18 'sold':23 'structur':14 'tube':7 'unit':26 'vacuum':6

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