From the street, Petaluma’s M. Maselli & Sons appears to be an ordinary hardware store, similar to other outlets where a shopper can stop in for new faucet valves, hinges for the gate or a flexible garden hose.

And, of course Maselli’s carries these items, along with every other conceivable tool or replacement part any contractor or weekend handyman could possibly need. But the view from the street and from inside Maselli’s 15,000-square-foot hardware store is just the tip of the proverbial iceberg — a 7-acre salvage yard with far from ordinary inventory of tools, pipe, steel and building materials also sprawls out behind the shop.

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