# Relationship history for MSHA mine 0405033

Current hierarchy: **Brian K  Hurt → Geo Aggregates → Sherwood Rd Quarry**

- 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:** Steven E  Baxman → Sherwood Rd Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baxman Gravel Co Inc → Sherwood Rd Quarry; 1989-05-01 to 2012-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Steven E  Baxman → Baxman Gravel Co Inc; 1989-05-01 to 2012-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Geo Aggregates → Sherwood Rd Quarry; 2012-04-16 to 2021-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Dennis James  Kirwan et al → Sherwood Rd Quarry; 2012-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis James  Kirwan et al → Geo Aggregates; 2012-04-16 to 2021-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Brian K  Hurt → Sherwood Rd Quarry; 2018-07-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Geo Aggregates → Sherwood Rd Quarry; 2021-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian K  Hurt → Geo Aggregates; 2021-06-08 to current/open; source msha-controller-operator-history