# Relationship history for MSHA mine 0301419

Current hierarchy: **Fondren Leo → S & W Rock & Gravel Inc → S & W ROCK AND GRAVEL INC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Larry  Duffield et al → S & W ROCK AND GRAVEL INC; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Souter Construction Company Inc → S & W ROCK AND GRAVEL INC; 1978-03-09 to 1980-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Duffield et al → Souter Construction Company Inc; 1978-03-09 to 1980-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Duffield et al → Souter Construction Company Inc; 1978-03-09 to 1980-02-28; source msha-controller-operator-history
- **operator_operates_mine:** S & W Rock & Gravel Inc → S & W ROCK AND GRAVEL INC; 1980-03-01 to 1981-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Wade R N Butch → S & W ROCK AND GRAVEL INC; 1980-03-01 to 1981-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Wade R N Butch → S & W Rock & Gravel Inc; 1980-03-01 to 1981-11-03; source msha-controller-operator-history
- **operator_operates_mine:** S & W Rock & Gravel Inc → S & W ROCK AND GRAVEL INC; 1981-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fondren Leo → S & W ROCK AND GRAVEL INC; 1981-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fondren Leo → S & W Rock & Gravel Inc; 1981-11-04 to current/open; source msha-controller-operator-history