# Relationship history for MSHA mine 4702892

Current hierarchy: **Schlosser Melissa → Durand Rock & Lime Quarry'S Inc → Pioneer**

- 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:** Underground-Excavation Inc → Pioneer; 1989-04-01 to 1990-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Swain James → Pioneer; 1989-04-01 to 1990-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Swain James → Underground-Excavation Inc; 1989-04-01 to 1990-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Durand Rock & Lime Quarry'S Inc → Pioneer; 1990-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schlosser Melissa → Pioneer; 1990-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schlosser Melissa → Durand Rock & Lime Quarry'S Inc; 1990-09-26 to current/open; source msha-controller-operator-history