<https://thecuriousforge.org/wp-content/uploads/2018/07/BridgePort-Milling-Machine-Manual-1.pdf#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://thecuriousforge.org/certification-prerequisites/bridgeport-milling-machine-manual/>