# Relationship history for MSHA mine 1400869

Current hierarchy: **Clarkson Construction Co; Everett Holding Co → Micro-Lite Inc → Micro-Lite Inc Pit**

- 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:** Micro-Lite Inc → Micro-Lite Inc Pit; 1950-01-01 to 1981-12-02; source msha-controller-operator-history
- **controller_controls_mine:** W T  Sharp → Micro-Lite Inc Pit; 1950-01-01 to 1981-12-02; source msha-controller-operator-history
- **controller_controls_operator:** W T  Sharp → Micro-Lite Inc; 1950-01-01 to 1981-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Micro-Lite Inc → Micro-Lite Inc Pit; 1981-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Everett Holding Co  et al → Micro-Lite Inc Pit; 1981-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everett Holding Co  et al → Micro-Lite Inc; 1981-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clarkson Construction Co et al → Micro-Lite Inc; 1981-12-03 to current/open; source msha-controller-operator-history