# Relationship history for MSHA mine 1502604

Current hierarchy: **International Minerals & Chemical Corp → Crescent Industries Inc → Mine No 5-C**

- 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:** Crescent Coal Company → Mine No 5-C; 1950-01-01 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Donald T → Mine No 5-C; 1950-01-01 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Donald T → Crescent Coal Company; 1950-01-01 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_mine:** International Minerals & Chemical Corp → Mine No 5-C; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crescent Industries Inc → Mine No 5-C; 1977-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Minerals & Chemical Corp → Crescent Industries Inc; 1977-07-11 to current/open; source msha-controller-operator-history