# Relationship history for MSHA mine 0503975

Current hierarchy: **Chenoweth Marion E → Chenoweth Construction → Glover Site**

- 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:** Custom Crushing → Glover Site; 1984-07-01 to 1986-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Glen → Glover Site; 1984-07-01 to 1986-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Glen → Custom Crushing; 1984-07-01 to 1986-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Chenoweth Construction → Glover Site; 1986-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chenoweth Marion E → Glover Site; 1986-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chenoweth Marion E → Chenoweth Construction; 1986-02-27 to current/open; source msha-controller-operator-history