Discovery Aluminum T-Square 1 1/2 in. wide x 12 in. blue plastic head

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"Discovery Aluminum T-Square 1 1/2 in. wide x 12 in. blue plastic head"
Source: selected by the editor, with permission from various art references and poster references.

Art Gallery: Discovery Aluminum T-Square 1 1/2 in. wide x 12 in. blue plastic head