# Relationship history for MSHA mine 2902424

Current hierarchy: **Brandon  Arnold → Custom Sand & Gravel, LLC → Brasher Pit**

- 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:** Grant  Langford et al → Brasher Pit; 2001-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Langford Tractor Work LLC → Brasher Pit; 2012-02-07 to 2020-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Grant  Langford et al → Langford Tractor Work LLC; 2012-02-07 to 2020-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Gynn  Langford et al → Langford Tractor Work LLC; 2012-02-07 to 2020-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Custom Sand & Gravel, LLC → Brasher Pit; 2020-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brandon  Arnold → Brasher Pit; 2020-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brandon  Arnold → Custom Sand & Gravel, LLC; 2020-08-03 to current/open; source msha-controller-operator-history