# Relationship history for MSHA mine 1511256

Current hierarchy: **Mehler Frank T → Lazy Seven Coal Company Inc → Lazy Seven 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Jimmy E  Hamilton et al → Lazy Seven No 2 Mine; 1976-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Combs Robert & Asbel Adkins → Lazy Seven No 2 Mine; 1978-04-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Gem Coal Company Inc → Lazy Seven No 2 Mine; 1978-07-01 to 1978-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy E  Hamilton et al → Tri-Gem Coal Company Inc; 1978-07-01 to 1978-11-08; source msha-controller-operator-history
- **operator_operates_mine:** C & A Coal Company → Lazy Seven No 2 Mine; 1978-11-09 to 1979-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Combs Robert & Asbel Adkins → C & A Coal Company; 1978-11-09 to 1979-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Lazy Seven Coal Company Inc → Lazy Seven No 2 Mine; 1979-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mehler Frank T → Lazy Seven No 2 Mine; 1979-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mehler Frank T → Lazy Seven Coal Company Inc; 1979-01-19 to current/open; source msha-controller-operator-history