# Relationship history for MSHA mine 1516625

Current hierarchy: **Bartley Marvin → Big Bass Fuels Inc → No 1**

- 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:** Ashcamp Construction Inc → No 1; 1989-05-01 to 1990-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Merritt Perry → No 1; 1989-05-01 to 1990-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Merritt Perry → Ashcamp Construction Inc; 1989-05-01 to 1990-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Workman Mining Company → No 1; 1990-08-24 to 1992-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Meade Doyle & Jim Justice → No 1; 1990-08-24 to 1992-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Meade Doyle & Jim Justice → Workman Mining Company; 1990-08-24 to 1992-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Bass Fuels Inc → No 1; 1992-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bartley Marvin → No 1; 1992-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Marvin → Big Bass Fuels Inc; 1992-03-31 to current/open; source msha-controller-operator-history