# Relationship history for MSHA mine 1519676

Current hierarchy: **Debra R  Mugumya → Black Fire Energy, Inc. → Sycamore 42**

- 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:** Eddie  Lawson → Sycamore 42; 2012-01-05 to 2012-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Debra R  Mugumya → Sycamore 42; 2012-05-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Fire Energy, Inc. → Sycamore 42; 2012-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Debra R  Mugumya → Black Fire Energy, Inc.; 2012-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eddie  Lawson → Black Fire Energy, Inc.; 2012-09-10 to 2012-05-13; source msha-controller-operator-history