# Relationship history for MSHA mine 0102204

Current hierarchy: **Dan  Middleton Sr; Dan  Middleton Jr → Middleton Dredging & Gravel → Ivey Pit**

- 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:** David Ivey Gravel → Ivey Pit; 1980-03-01 to 1983-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Ivey David E → Ivey Pit; 1980-03-01 to 1983-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Ivey David E → David Ivey Gravel; 1980-03-01 to 1983-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Ivey Gravel → Ivey Pit; 1983-02-08 to 1983-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Cooper Nolan → Ivey Pit; 1983-02-08 to 1983-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Cooper Nolan → Ivey Gravel; 1983-02-08 to 1983-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Middleton Dredging & Gravel → Ivey Pit; 1983-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Middleton Sr  et al → Ivey Pit; 1983-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Middleton Sr  et al → Middleton Dredging & Gravel; 1983-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Middleton Jr  et al → Middleton Dredging & Gravel; 1983-11-16 to current/open; source msha-controller-operator-history