# Relationship history for MSHA mine 1001868

Current hierarchy: **Trent Charles  Frasure → Trent Frasure Construction LLC → Trent Frasure Construction**

- 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

- **operator_operates_mine:** Frasure Construction → Trent Frasure Construction; 1991-04-01 to 2003-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Charlie  Frasure  et al → Trent Frasure Construction; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charlie  Frasure  et al → Frasure Construction; 1991-04-01 to 2003-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Frasure  et al → Frasure Construction; 1991-04-01 to 2003-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Trent Frasure Construction LLC → Trent Frasure Construction; 2003-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Trent Charles  Frasure → Trent Frasure Construction; 2003-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trent Charles  Frasure → Trent Frasure Construction LLC; 2003-09-01 to current/open; source msha-controller-operator-history