# Relationship history for MSHA mine 1512584

Current hierarchy: **Layne Patrick R → Layne Processing Inc → No 2 Tipple**

- 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:** El Paso Energy Corp → No 2 Tipple; 1979-06-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Iron Coal & Coke Company → No 2 Tipple; 1980-10-01 to 1982-11-21; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Virginia Iron Coal & Coke Company; 1980-10-01 to 1982-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Layne Patrick R → No 2 Tipple; 1982-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Layne Processing Inc → No 2 Tipple; 1982-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Patrick R → Layne Processing Inc; 1982-11-22 to current/open; source msha-controller-operator-history