# Relationship history for MSHA mine 2800015

Current hierarchy: **East SM, LLC → Stavola Construction Materials Inc → Stavola Construction Materials, 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

- **operator_operates_mine:** Houdaille Construction Materials Inc → Stavola Construction Materials, Inc.; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Houdaille Industries Inc → Stavola Construction Materials, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houdaille Industries Inc → Houdaille Construction Materials Inc; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Stavola Construction Materials Inc → Stavola Construction Materials, Inc.; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Stavola III et al → Stavola Construction Materials, Inc.; 1978-04-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Stavola III et al → Stavola Construction Materials Inc; 1978-04-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Stavola et al → Stavola Construction Materials Inc; 1978-04-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_mine:** East SM, LLC → Stavola Construction Materials, Inc.; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** East SM, LLC → Stavola Construction Materials Inc; 2024-10-01 to current/open; source msha-controller-operator-history