SPIROL by SPIROL INTERNATIONAL HOLDING CORPORATION (Track this)
Intl: (006) Metal goods US: 013 Filing date: 16-Nov-1956 Serial number: 72019351
SPIROLOX RETAINING RINGS by SMALLEY STEEL RING COMPANY (Track this)
Intl: (007) Machinery US: 023 Filing date: 18-Jun-1948 Serial number: 71559640