▼ Menu

Automatic valve envelope machines at Mullard Blackburn

Mullard Outlook, March, 1964.
    
Extras ▼

 

An automatic set-up at Mullard Blackburn for producing valve envelopes from lengths of glass tubing. The sequence of operations is to form the end of the bulb, cut the required tube length, exhaust stem and bulb, check the seal and pack.
Use browser back button to return.