# Relationship history for MSHA mine 4602010

Current hierarchy: **M A Hanna Company → Terry Eagle Coal Company → Robert Eagle No 3 Mine**

- 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

- **operator_operates_mine:** Hutchinson Brothers Coal Company → Robert Eagle No 3 Mine; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Hutchinson Elmer → Robert Eagle No 3 Mine; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Hutchinson Elmer → Hutchinson Brothers Coal Company; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_mine:** M A Hanna Company et al → Robert Eagle No 3 Mine; 1980-10-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Terry Eagle Coal Company-Limited Partnership → Robert Eagle No 3 Mine; 1981-06-17 to 1985-09-26; source msha-controller-operator-history
- **controller_controls_operator:** M A Hanna Company et al → Terry Eagle Coal Company-Limited Partnership; 1981-06-17 to 1985-09-26; source msha-controller-operator-history
- **controller_controls_operator:** W R Grace Company et al → Terry Eagle Coal Company-Limited Partnership; 1981-06-17 to 1985-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Terry Eagle Coal Company → Robert Eagle No 3 Mine; 1985-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M A Hanna Company → Robert Eagle No 3 Mine; 1985-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M A Hanna Company → Terry Eagle Coal Company; 1985-09-27 to current/open; source msha-controller-operator-history