Manufacturer profile
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Published sources
Evidence at a glance
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Greenstone Slate Company official website
Greenstone Slate Company produces Vermont roofing slate and lists a business contact in Poultney, Vermont. Poultney is business contact scope only, not a verified quarry address. Contact/mailing and GPS-routing addresses are distinct. First-party operating name Greenstone Slate Company; independent legal-registration standing is not established. No claim of domestic origin for all accessories, systems or products; ownership and certification are unverified.
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