# Relationship history for MSHA mine 2900178

Current hierarchy: **Ted  Martinez → Bar J Sand & Gravel → Casino Mine**

- 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:** Ernest Teeter Trucking Inc → Casino Mine; 1950-01-01 to 1997-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Ernest  Teeter → Casino Mine; 1950-01-01 to 1997-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Ernest  Teeter → Ernest Teeter Trucking Inc; 1950-01-01 to 1997-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Bar J Sand & Gravel → Casino Mine; 1997-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Martinez → Casino Mine; 1997-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Martinez → Bar J Sand & Gravel; 1997-03-31 to current/open; source msha-controller-operator-history