# Relationship history for MSHA mine 3901380

Current hierarchy: **Steve  Burns → Pacer Corp → PACER MICA**

- 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:** Julie  Oswald et al → PACER MICA; 1950-01-01 to 2016-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Pacer Corp → PACER MICA; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julie  Oswald et al → Pacer Corp; 1990-10-01 to 2016-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Burns et al → PACER MICA; 2016-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Burns et al → Pacer Corp; 2016-02-19 to current/open; source msha-controller-operator-history