# Relationship history for MSHA mine 4603969

Current hierarchy: **M A Hanna Company; W R Grace Company → Terry Eagle Coal Company-Limited Partnership → William Eagle No 1 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:** William Eagle Coal Company → William Eagle No 1 Mine; 1974-08-15 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Seelinger et al → William Eagle No 1 Mine; 1974-08-15 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Seelinger et al → William Eagle Coal Company; 1974-08-15 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_mine:** M A Hanna Company et al → William Eagle No 1 Mine; 1980-10-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Terry Eagle Coal Company-Limited Partnership → William Eagle No 1 Mine; 1980-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M A Hanna Company et al → Terry Eagle Coal Company-Limited Partnership; 1980-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W R Grace Company et al → Terry Eagle Coal Company-Limited Partnership; 1980-10-09 to current/open; source msha-controller-operator-history