# Relationship history for MSHA mine 1518497

Current hierarchy: **Rex  Greer; Jerry  Greer → Elmo Greer & Sons LLC → Pittsburg Job**

- 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:** Rex  Greer et al → Pittsburg Job; 1976-06-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elmo Greer & Sons LLC → Pittsburg Job; 2002-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Greer et al → Elmo Greer & Sons LLC; 2002-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Greer et al → Elmo Greer & Sons LLC; 2002-01-02 to current/open; source msha-controller-operator-history