# Relationship history for MSHA mine 0404629

Current hierarchy: **Schedell Mary → Ashland Granite Corp → Ashland Granite 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:** R G Atkinson → Ashland Granite Pit; 1983-03-01 to 1984-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Atkinson R G → Ashland Granite Pit; 1983-03-01 to 1984-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Atkinson R G → R G Atkinson; 1983-03-01 to 1984-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Ashland Granite Corp → Ashland Granite Pit; 1984-07-10 to 1991-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Schedell Mary → Ashland Granite Pit; 1984-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schedell Mary → Ashland Granite Corp; 1984-07-10 to 1991-01-31; source msha-controller-operator-history
- **operator_operates_mine:** A-1 Soils Company → Ashland Granite Pit; 1991-02-01 to 1992-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Fenton H G Material Company → Ashland Granite Pit; 1991-02-01 to 1992-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Fenton H G Material Company → A-1 Soils Company; 1991-02-01 to 1992-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Ashland Granite Corp → Ashland Granite Pit; 1992-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schedell Mary → Ashland Granite Corp; 1992-03-16 to current/open; source msha-controller-operator-history