# Relationship history for MSHA mine 3607747

Current hierarchy: **Snyder Associated Companies Inc → Allegheny Mineral Corp. → Boyers**

- 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:** Medusa Corp → Boyers; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Snyder Associated Companies Inc → Boyers; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & C Drilling Inc → Boyers; 1985-10-01 to 1990-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Chutz → Boyers; 1985-10-01 to 1990-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Chutz → C & C Drilling Inc; 1985-10-01 to 1990-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Aloe et al → Boyers; 1989-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → Boyers; 1990-06-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Aggregates Company; 1990-06-01 to 1994-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Quality Aggregates Inc → Boyers; 1994-05-02 to 2013-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Aloe et al → Quality Aggregates Inc; 1994-05-02 to 2013-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Allegheny Mineral Corp. → Boyers; 2013-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Snyder Associated Companies Inc → Allegheny Mineral Corp.; 2013-06-26 to current/open; source msha-controller-operator-history