

Researchers say that the term bed sheet was first used in the 15th century, but it wasn’t until 1959 that the fitted bed sheet was invented, by the American, Bertha Berman.
To help make installations safer, Openchannelflow offers Fiberglass Grating Covers for its line of flumes and Packaged Metering Manholes. Using a unique narrow opening grating, Openchannnelflow molds in a support channel at the top of the flume. The fiberglass grating is then cut to size and nestled into the flume.