# Relationship history for MSHA mine 2401563

Current hierarchy: **Weis Byron → 2900 Development Corp → Atlantic & Pacific**

- 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:** Ibex Construction → Atlantic & Pacific; 1980-06-01 to 1988-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Ibex Construction → Atlantic & Pacific; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ibex Construction → Ibex Construction; 1980-06-01 to 1988-09-27; source msha-controller-operator-history
- **operator_operates_mine:** 2900 Development Corp → Atlantic & Pacific; 1988-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weis Byron → Atlantic & Pacific; 1988-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weis Byron → 2900 Development Corp; 1988-09-28 to current/open; source msha-controller-operator-history