# Relationship history for MSHA mine 1511614

Current hierarchy: **Allen Curtis → Joel Coal Company Inc → 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:** C C C Coal Company → No 1 Mine; 1978-10-01 to 1979-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Lloyd Et Al → No 1 Mine; 1978-10-01 to 1979-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Lloyd Et Al → C C C Coal Company; 1978-10-01 to 1979-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Joel Coal Company Inc → No 1 Mine; 1979-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allen Curtis → No 1 Mine; 1979-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen Curtis → Joel Coal Company Inc; 1979-09-17 to current/open; source msha-controller-operator-history