<https://www.marlinforum.com/threads/1950s-model-90-16-gauge-family-heirloom.3087/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.marlinforum.com/threads/1950s-model-90-16-gauge-family-heirloom.3087/#post-51548>