# Relationship history for MSHA mine 3503747

Current hierarchy: **Ramsey  Bushnell; Mitch  Bushnell; Mickey  Bushnell → Merchen & Reed Gravel Co. Inc. → Portable 1**

- 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 L Bushnell → Portable 1; 1950-01-01 to 2024-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Merchen & Reed Gravel Co. Inc. → Portable 1; 2010-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L Bushnell → Merchen & Reed Gravel Co. Inc.; 2010-04-30 to 2024-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Ramsey  Bushnell et al → Portable 1; 2024-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramsey  Bushnell et al → Merchen & Reed Gravel Co. Inc.; 2024-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitch  Bushnell et al → Merchen & Reed Gravel Co. Inc.; 2024-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mickey  Bushnell et al → Merchen & Reed Gravel Co. Inc.; 2024-11-04 to current/open; source msha-controller-operator-history