# Relationship history for MSHA mine 1510434

Current hierarchy: **Mc Clain Robert → Calvary Enterprises Inc → Calvary Enterprise**

- 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:** Bell & Walker Inc → Calvary Enterprise; 1977-05-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Walker Jerald K → Calvary Enterprise; 1977-05-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Walker Jerald K → Bell & Walker Inc; 1977-05-01 to 1977-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Hallandale Mining Company Inc → Calvary Enterprise; 1977-07-01 to 1978-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Hallandale Rock & Sand Company → Calvary Enterprise; 1977-07-01 to 1978-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Hallandale Rock & Sand Company → Hallandale Mining Company Inc; 1977-07-01 to 1978-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Calvary Enterprises Inc → Calvary Enterprise; 1978-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Clain Robert → Calvary Enterprise; 1978-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clain Robert → Calvary Enterprises Inc; 1978-07-20 to current/open; source msha-controller-operator-history