# Relationship history for MSHA mine 2901683

Current hierarchy: **George  Lotspeich → Cobb Resources Corp → Section 12**

- 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:** Koppen Eckhardt M → Section 12; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cobb Resources Corp → Section 12; 1978-03-09 to 1979-09-05; source msha-controller-operator-history
- **controller_controls_mine:** George  Lotspeich → Section 12; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Lotspeich → Cobb Resources Corp; 1978-03-09 to 1979-09-05; source msha-controller-operator-history
- **operator_operates_mine:** Koppen Mining Construction Corp → Section 12; 1979-09-06 to 1980-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Koppen Eckhardt M → Koppen Mining Construction Corp; 1979-09-06 to 1980-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Cobb Resources Corp → Section 12; 1980-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Lotspeich → Cobb Resources Corp; 1980-04-11 to current/open; source msha-controller-operator-history