# Relationship history for MSHA mine 4703879

Current hierarchy: **Donald C Tierney; Joanne K Tierney; Jerad R Tierney; James M Lang → Rio Ag Lime Products, LLC → Rio Quarry**

- 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:** Rio Ag Lime Products, LLC → Rio Quarry; 2020-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joanne K Tierney et al → Rio Quarry; 2020-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joanne K Tierney et al → Rio Ag Lime Products, LLC; 2020-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald C Tierney et al → Rio Ag Lime Products, LLC; 2020-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James M Lang et al → Rio Ag Lime Products, LLC; 2020-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerad R Tierney et al → Rio Ag Lime Products, LLC; 2020-07-07 to current/open; source msha-controller-operator-history