# Relationship history for MSHA mine 1511982

Current hierarchy: **Thomas Ancil & T L Crabtree → Black Spade Coal Company → No 2 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:** Bethel Coal Company → No 2 Mine; 1979-08-01 to 1980-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Lloyd Et Al → No 2 Mine; 1979-08-01 to 1980-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Lloyd Et Al → Bethel Coal Company; 1979-08-01 to 1980-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Virginia-Lee Coal Company → No 2 Mine; 1980-04-22 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Austin Bill & W C Forrester → No 2 Mine; 1980-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Austin Bill & W C Forrester → Virginia-Lee Coal Company; 1980-04-22 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Ancil & T L Crabtree → No 2 Mine; 1982-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Spade Coal Company → No 2 Mine; 1983-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Ancil & T L Crabtree → Black Spade Coal Company; 1983-01-25 to current/open; source msha-controller-operator-history