# Relationship history for MSHA mine 1201590

Current hierarchy: **Don  Foertsch → Little Sandy Coal Company Inc → Little Sandy**

- 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:** Little Sandy Coal Company Inc → Little Sandy; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Foertsch et al → Little Sandy; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Foertsch et al → Little Sandy Coal Company Inc; 1977-11-01 to current/open; source msha-controller-operator-history