# Relationship history for MSHA mine 1511497

Current hierarchy: **Law Ted B → Beaver Elkhorn Fuels Inc → Bosco Tipple**

- 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:** Beaver Elkhorn Fuels Inc → Bosco Tipple; 1978-08-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Large Roger → Bosco Tipple; 1978-08-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Large Roger → Beaver Elkhorn Fuels Inc; 1978-08-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Beaver Elkhorn Fuels Inc → Bosco Tipple; 1979-04-01 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Martin Del Kerwyn → Bosco Tipple; 1979-04-01 to 1982-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Martin Del Kerwyn → Beaver Elkhorn Fuels Inc; 1979-04-01 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_mine:** M Lynn  Parrish → Bosco Tipple; 1981-01-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Mac Sales → Bosco Tipple; 1981-02-18 to 1981-11-16; source msha-controller-operator-history
- **controller_controls_operator:** M Lynn  Parrish → Coal Mac Sales; 1981-02-18 to 1981-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Beaver Elkhorn Fuels Inc → Bosco Tipple; 1981-11-17 to 1982-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Martin Del Kerwyn → Beaver Elkhorn Fuels Inc; 1981-11-17 to 1982-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Beaver Elkhorn Fuels Inc → Bosco Tipple; 1982-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Law Ted B → Bosco Tipple; 1982-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Law Ted B → Beaver Elkhorn Fuels Inc; 1982-12-02 to current/open; source msha-controller-operator-history