# Relationship history for MSHA mine 4405284

Current hierarchy: **Edwards Danie G → Grace Coal Corp → Mine No 1**

- 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

- **controller_controls_mine:** Smith Paul → Mine No 1; 1979-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smith Coal Corp → Mine No 1; 1979-09-01 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Smith Paul → Smith Coal Corp; 1979-09-01 to 1980-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Smith Coal Corp → Mine No 1; 1980-10-20 to 1981-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Lark John R → Mine No 1; 1980-10-20 to 1981-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Lark John R → Smith Coal Corp; 1980-10-20 to 1981-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Grace Coal Corp → Mine No 1; 1981-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edwards Danie G → Mine No 1; 1981-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edwards Danie G → Grace Coal Corp; 1981-10-26 to current/open; source msha-controller-operator-history