# Relationship history for MSHA mine 3304720

Current hierarchy: **Gerry  Salisbury; Mark  Salisbury; Denny  Salisbury → Tow Path Ready Mix → Jackson Plant**

- 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

- **controller_controls_mine:** Thomas P  Salisbury et al → Jackson Plant; 2000-06-01 to 2014-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Gerry  Salisbury et al → Jackson Plant; 2014-11-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tow Path Ready Mix → Jackson Plant; 2015-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerry  Salisbury et al → Tow Path Ready Mix; 2015-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Denny  Salisbury et al → Tow Path Ready Mix; 2015-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Salisbury et al → Tow Path Ready Mix; 2015-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas P  Salisbury et al → Tow Path Ready Mix; 2015-10-29 to 2014-11-29; source msha-controller-operator-history