The only hollow ware they were known to have made are waffle irons. The earliest known date from the beginning – as shown in the following pictures. This is the only one of this style that I’ve seen. Picture on the left is an advertisement from 1910, the drawing is missing the handle but everything else is identical.
Somewhere between 1910 and 1914, Taylor Forbes changed the design on the waffle iron – as shown below. Ad from 1914. These waffle irons will likely date between 1910 and 1934 when they changed the company name. Note the Taylor-Forbes Co Ltd in both pictures.
As for Trivets, Diamond T or Diamond TF – as shown below. Not really sure if these can be dated.
Taylor-Forbes Ltd was sold in 1950, and bankrupt by 1955.