# Relationship history for MSHA mine 1516448

Current hierarchy: **TECO Energy Inc → Christian Energies Inc → Christian No2**

- 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:** Christian Richard A → Christian No2; 1987-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Christian Energies Inc → Christian No2; 1988-08-01 to 1991-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Christian Richard A → Christian Energies Inc; 1988-08-01 to 1991-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Christian Energies Inc → Christian No2; 1991-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** TECO Energy Inc → Christian No2; 1991-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Christian Energies Inc; 1991-07-09 to current/open; source msha-controller-operator-history