# Relationship history for MSHA mine 1201541

Current hierarchy: **Damon G  Fortune → Winslow Coal Company Inc → Tennyson Strip**

- 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:** F M Anderson Sr & Associates → Tennyson Strip; 1976-08-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Anderson F M → Tennyson Strip; 1976-08-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Anderson F M → F M Anderson Sr & Associates; 1976-08-01 to 1977-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Winslow Coal Company Inc → Tennyson Strip; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Damon G  Fortune → Tennyson Strip; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Damon G  Fortune → Winslow Coal Company Inc; 1977-03-01 to current/open; source msha-controller-operator-history