# Relationship history for MSHA mine 4103178

Current hierarchy: **Craig  Snell → Texas Sand & Gravel Company Inc → Pc #2**

- 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:** Roy P  Eastland III → Pc #2; 1950-01-01 to 2016-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Grant Construction Company → Pc #2; 1983-06-01 to 1986-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Tommy  Grant → Pc #2; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Grant → Grant Construction Company; 1983-06-01 to 1986-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Getman Sand & Gravel → Pc #2; 1986-02-20 to 1988-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Getman Bob → Pc #2; 1986-02-20 to 1988-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Getman Bob → Getman Sand & Gravel; 1986-02-20 to 1988-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Texas Sand & Gravel Company Inc → Pc #2; 1988-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy P  Eastland III → Texas Sand & Gravel Company Inc; 1988-09-22 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Craig  Snell → Pc #2; 2016-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Snell → Texas Sand & Gravel Company Inc; 2016-06-01 to current/open; source msha-controller-operator-history