# Relationship history for MSHA mine 1511771

Current hierarchy: **Childers David → T-Berry Mining Inc → No 3 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:** Lee Coal Company → No 3 Mine; 1979-02-01 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Adams Terry J & Larry W → No 3 Mine; 1979-02-01 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Adams Terry J & Larry W → Lee Coal Company; 1979-02-01 to 1980-10-08; source msha-controller-operator-history
- **operator_operates_mine:** T-Berry Mining Inc → No 3 Mine; 1980-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Childers David → No 3 Mine; 1980-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Childers David → T-Berry Mining Inc; 1980-10-09 to current/open; source msha-controller-operator-history