https://heckler.com/
Heckler: AV Furniture for Modern Workspaces
Premium AV furniture, mounts, carts, lecterns, and wall systems for enterprise collaboration, education, healthcare, hospitality, and public spaces.
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https://sfbay.craigslist.org/pen/bfs/d/hayward-heckler-av-display-cart/7921624720.html
Heckler AV Display Cart - business/commercial - by owner - sale - craigslist
I have several of these carts brand new in the box. AV Cart for VESA 400 Displays. Heckler H489
heckler avdisplay cartbusiness commercialby ownersale