A distributor insert screen cover adapted for use both as a particulate bay screen cover and as a lightweight and stable distributor insert stand. A screen is provided in multiple panels that span portions of an open, particulate bay top wall. The panels may be fitted together when removed from the particulate...http://www.google.com.hk/patents/US6520458?utm_source=gb-gplus-share專利 US6520458 - Distributor insert dual function stand and storage method
