# Relationship history for MSHA mine 2801021

Current hierarchy: **Charles  Ehrmann → Mission Materials → Mission Materials**

- 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:** 284 Aggregates, LLC. → Mission Materials; 2009-03-11 to 2022-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Capasso et al → Mission Materials; 2009-03-11 to 2015-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Capasso et al → 284 Aggregates, LLC.; 2009-03-11 to 2015-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Michael  O'Krepky et al → 284 Aggregates, LLC.; 2009-03-11 to 2015-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Capasso → Mission Materials; 2015-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Capasso → 284 Aggregates, LLC.; 2015-10-01 to 2022-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Mission Materials → Mission Materials; 2022-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Ehrmann → Mission Materials; 2022-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Ehrmann → Mission Materials; 2022-06-24 to current/open; source msha-controller-operator-history