# Relationship history for MSHA mine 4103470

Current hierarchy: **Trent Ron → Trent Sand & Gravel Inc → Ashe Lake 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Trent Ron → Ashe Lake Pit; 1978-02-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ashe Lake Sand & Gravel Inc → Ashe Lake Pit; 1987-05-01 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Kelly Mike → Ashe Lake Pit; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly Mike → Ashe Lake Sand & Gravel Inc; 1987-05-01 to 1988-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Dds Development Inc → Ashe Lake Pit; 1988-04-01 to 1988-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Denise  Schneider → Ashe Lake Pit; 1988-04-01 to 1988-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Denise  Schneider → Dds Development Inc; 1988-04-01 to 1988-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Trent Sand & Gravel Inc → Ashe Lake Pit; 1988-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trent Ron → Trent Sand & Gravel Inc; 1988-06-22 to current/open; source msha-controller-operator-history