# Relationship history for MSHA mine 1201813

Current hierarchy: **Megan M Black; Zach A Black → East Side Aggregates Inc → East Side Aggregates Inc**

- 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:** Joseph S  Unger → East Side Aggregates Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David A  Musser → East Side Aggregates Inc; 1950-01-01 to 1990-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Mill Creek Stone & Gravel Corp → East Side Aggregates Inc; 1980-09-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph S  Unger → Mill Creek Stone & Gravel Corp; 1980-09-01 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** H & W Sand & Gravel Corp → East Side Aggregates Inc; 1985-07-01 to 1990-02-04; source msha-controller-operator-history
- **controller_controls_operator:** David A  Musser → H & W Sand & Gravel Corp; 1985-07-01 to 1990-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Huntington Ready Mix Inc → East Side Aggregates Inc; 1990-02-05 to 2014-01-09; source msha-controller-operator-history
- **controller_controls_mine:** James  Marcuccilli → East Side Aggregates Inc; 1990-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Marcuccilli → Huntington Ready Mix Inc; 1990-02-05 to 2014-01-09; source msha-controller-operator-history
- **operator_operates_mine:** CAT EXCAVATING, INC → East Side Aggregates Inc; 2014-01-10 to 2021-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Chris A  Tyson et al → East Side Aggregates Inc; 2014-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris A  Tyson et al → CAT EXCAVATING, INC; 2014-01-10 to 2021-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Carrie A  Tyson et al → CAT EXCAVATING, INC; 2014-01-10 to 2021-07-11; source msha-controller-operator-history
- **operator_operates_mine:** East Side Aggregates Inc → East Side Aggregates Inc; 2021-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Megan M Black et al → East Side Aggregates Inc; 2021-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Megan M Black et al → East Side Aggregates Inc; 2021-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zach A Black et al → East Side Aggregates Inc; 2021-07-12 to current/open; source msha-controller-operator-history