# Relationship history for MSHA mine 0404757

Current hierarchy: **Rivera Philip A → Par Mining & Exploration → Mockingbird 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

- **controller_controls_mine:** John E  Newman et al → Mockingbird Mine; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western States Mining Company Inc → Mockingbird Mine; 1985-07-01 to 1986-08-31; source msha-controller-operator-history
- **controller_controls_operator:** John E  Newman et al → Western States Mining Company Inc; 1985-07-01 to 1986-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Par Mining & Exploration → Mockingbird Mine; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rivera Philip A → Mockingbird Mine; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rivera Philip A → Par Mining & Exploration; 1986-09-01 to current/open; source msha-controller-operator-history