I'm sure there are a lot of collectors out there who have some of the Heinemann Electric Co. Sensory (trademarked name in 1923) Lightning arresters, Strains, and porcelain standoffs. I always like the embossings on their items and unique shapes. Here is a photo of the radio strains I have. On the left side down- Cat No. 3017, 5 and 4 rib strains. On the right side down- Cat. No. 3096 2 ribs, Cat. No. 3096 4 rib skinny style and last marked Sensory/ No.3108 white strain. Even though most of their items were in brown, they still had some unique colors.