In roughly 1971 or '72, Rockwell Manufacturing Co.'s Canadian operations, Rockwell Manufacturing Co. of Canada, Ltd.—created by their 1953 acquisition of Callander Foundry & Manufacturing Co., makers of Beaver Power Tools—was renamed to Rockwell International of Canada Ltd. That name lasted until 1984 when Rockwell's American and Canadian woodworking machinery operations were sold to Pentair. Pentair put all of those operations under a single corporate entity, Delta International Machinery Corp. We have also seen the name Beaver/Delta Machinery Corp. in an advertisement from October 1984.

For US-made Delta/Rockwell machines we have serial number data that can be used to determine the date of manufacture of any such machines made from about 1939 onwards. However, despite efforts on our part we have not been able to obtain such information for Canadian-made Beaver/Delta/Rockwell machines. If you are trying to determine the approximate year of manufacture of a Unisaw (Beaver 7200, or a Delta/Rockwell Model 34-45x) see this chart.

Information Sources

• 1/2 HP motor from Rockwell Manufacturing Co. of Canada, Ltd., "manufactured by Tamper Division Canada Iron Foundries Ltd."
• A 1973 edition of Skyline (a Rockwell publication), available online in Snippet Mode through Google Books, says, "Our assignment: to tell the story of Rockwell International of Canada Ltd.— a venture in which eight Canadian subsidiaries, including more than 20 plants and offices in Ontario and Quebec provinces, were combined a year and a half ago..."
• The Rockwell Uniplane, introduced in 1966, was developed in Canada, first by John C. Ryan of Toronto, then by Ashman Industries, Ltd. of Hamilton. At that point it was acquired by Rockwell Manufacturing Co. of Pittsburgh. The design of the Uniplane underwent considerable refinement for manufacturing, and that refinement happened at Rockwell Manufacturing Co. of Canada, Ltd. See the Information Sources section of our article on Ashman Industries for more.