# Relationship history for MSHA mine 1502217

Current hierarchy: **Mitchell Carl → Mitchell Branch Coal Corp → 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

- **controller_controls_mine:** Occidental Petroleum Corp → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crider Mining Company → No 1 Mine; 1950-01-01 to 1973-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Crider James → No 1 Mine; 1950-01-01 to 1985-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Crider James → Crider Mining Company; 1950-01-01 to 1973-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Island Creek Coal Company → No 1 Mine; 1973-04-01 to 1975-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1973-04-01 to 1975-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Mitchell Branch Coal Corp → No 1 Mine; 1975-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mitchell Carl → No 1 Mine; 1975-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell Carl → Mitchell Branch Coal Corp; 1975-01-15 to current/open; source msha-controller-operator-history