# Relationship history for MSHA mine 2001579

Current hierarchy: **Howard C.  Opperman; Robert R.  Caughlin → Millington Gravel LLC → Millington Gravel LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Millington Gravel Company → Millington Gravel LLC; 1950-01-01 to 2005-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Fred S  Ward → Millington Gravel LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred S  Ward → Millington Gravel Company; 1950-01-01 to 2005-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Millington Gravel LLC → Millington Gravel LLC; 2005-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert R.  Caughlin et al → Millington Gravel LLC; 2005-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert R.  Caughlin et al → Millington Gravel LLC; 2005-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard C.  Opperman et al → Millington Gravel LLC; 2005-09-27 to current/open; source msha-controller-operator-history