Positive Lock Washer Co
of 20-24 James Watt Street, Glasgow
- 1913 Advert for 'Kolok' lock washers. Of 80-84 James Watt Street, Glasgow
- 1917 Advert for 'Kolok' lock washers. 'Made and sold in twelve months, 153,000,000'
Sources of Information
- Mechanical World Year Book 1913. Published by Emmott and Co of Manchester. Advert p25
- Mechanical World Year Book 1917. Published by Emmott and Co of Manchester. Advert p196