# Relationship history for MSHA mine 1502883

Current hierarchy: **Little Bethel & Carmel → C B Coal Company → No 4 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:** Little Bethel & Carmel → No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Grove Coal Co Inc → No 4 Mine; 1950-01-01 to 1976-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Cedar Grove Coal Co Inc → No 4 Mine; 1950-01-01 to 1976-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Cedar Grove Coal Co Inc → Cedar Grove Coal Co Inc; 1950-01-01 to 1976-03-01; source msha-controller-operator-history
- **operator_operates_mine:** C B Coal Company → No 4 Mine; 1976-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Little Bethel & Carmel → C B Coal Company; 1976-03-02 to current/open; source msha-controller-operator-history