# Relationship history for MSHA mine 1510354

Current hierarchy: **Spade Tommy → Spade Trucking → No 1 Surface**

- 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:** Jimmy E  Hamilton et al → No 1 Surface; 1974-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nally & Haydon Inc → No 1 Surface; 1974-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple I Company Inc → No 1 Surface; 1977-01-01 to 1977-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy E  Hamilton et al → Triple I Company Inc; 1977-01-01 to 1977-04-28; source msha-controller-operator-history
- **operator_operates_mine:** B & R Mining Inc → No 1 Surface; 1977-04-29 to 1978-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Kennedy Lyle → No 1 Surface; 1977-04-29 to 1978-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Kennedy Lyle → B & R Mining Inc; 1977-04-29 to 1978-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Nally & Haydon Coal Company Inc → No 1 Surface; 1978-04-24 to 1981-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Nally & Haydon Inc → Nally & Haydon Coal Company Inc; 1978-04-24 to 1981-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Spade Trucking → No 1 Surface; 1981-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spade Tommy → No 1 Surface; 1981-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spade Tommy → Spade Trucking; 1981-01-28 to current/open; source msha-controller-operator-history