# Relationship history for MSHA mine 2301717

Current hierarchy: **Baily Russell E → Acorn Systems Inc → Boonesboro 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:** Holiday Coal Company → Boonesboro Mine; 1978-09-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Harold Et Al → Boonesboro Mine; 1978-09-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Harold Et Al → Holiday Coal Company; 1978-09-01 to 1980-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Holiday Coal Company → Boonesboro Mine; 1980-03-20 to 1982-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Hammond Robert L → Boonesboro Mine; 1980-03-20 to 1982-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Hammond Robert L → Holiday Coal Company; 1980-03-20 to 1982-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Mid Missouri Energy Corp → Boonesboro Mine; 1982-06-12 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Dunleavy John P Et Al → Boonesboro Mine; 1982-06-12 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Dunleavy John P Et Al → Mid Missouri Energy Corp; 1982-06-12 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Baily Russell E → Boonesboro Mine; 1986-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Acorn Systems Inc → Boonesboro Mine; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baily Russell E → Acorn Systems Inc; 1986-04-01 to current/open; source msha-controller-operator-history