# Relationship history for MSHA mine 2901905

Current hierarchy: **Riggs Earl Jr & Swede Larson → S & S Mining Company → S & S Mining Company**

- 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:** Ford Spoonemore → S & S Mining Company; 1983-02-01 to 1989-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Spoonemore Ford → S & S Mining Company; 1983-02-01 to 1989-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Spoonemore Ford → Ford Spoonemore; 1983-02-01 to 1989-05-02; source msha-controller-operator-history
- **operator_operates_mine:** S & S Mining Company → S & S Mining Company; 1989-05-03 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Riggs Earl Jr & Swede Larson → S & S Mining Company; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riggs Earl Jr & Swede Larson → S & S Mining Company; 1989-05-03 to 1989-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Southwestern Holeopener Inc → S & S Mining Company; 1990-01-01 to 1991-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Riley Jim → S & S Mining Company; 1990-01-01 to 1991-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Riley Jim → Southwestern Holeopener Inc; 1990-01-01 to 1991-02-27; source msha-controller-operator-history
- **operator_operates_mine:** S & S Mining Company → S & S Mining Company; 1991-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riggs Earl Jr & Swede Larson → S & S Mining Company; 1991-02-28 to current/open; source msha-controller-operator-history