# Relationship history for MSHA mine 0101809

Current hierarchy: **Robson Richard A → Mobile Fuel Shipping Inc → Pit 3**

- 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

- **controller_controls_mine:** Robson Richard A → Pit 3; 1974-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robinson Tom M Iii--Tom E Diggs & Dick Clayton → Pit 3; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oliver Coal Company → Pit 3; 1977-12-01 to 1978-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Tom M Iii--Tom E Diggs & Dick Clayton → Oliver Coal Company; 1977-12-01 to 1978-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Fuel Shipping Inc → Pit 3; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robson Richard A → Mobile Fuel Shipping Inc; 1978-02-01 to current/open; source msha-controller-operator-history