# Relationship history for MSHA mine 1001719

Current hierarchy: **Michael  Denke → Patriot Construction & Rock Products LLC → Portable Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Patriot Construction & Rock Products LLC → Portable Crusher; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Wemhoff et al → Portable Crusher; 1986-03-01 to 2005-09-05; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Wemhoff et al → Patriot Construction & Rock Products LLC; 1986-03-01 to 2005-09-05; source msha-controller-operator-history
- **controller_controls_operator:** William L  Wemhoff et al → Patriot Construction & Rock Products LLC; 1986-03-01 to 2005-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Denke → Portable Crusher; 2005-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Denke → Patriot Construction & Rock Products LLC; 2005-09-06 to current/open; source msha-controller-operator-history