# Relationship history for MSHA mine 0503662

Current hierarchy: **Kendall Mining International Inc → Kendall Mining Corp → Silver Heels Mine**

- 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:** Texas Mining Corp → Silver Heels Mine; 1981-05-01 to 1983-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Jacob → Silver Heels Mine; 1981-05-01 to 1983-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Jacob → Texas Mining Corp; 1981-05-01 to 1983-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Kendall Mining Corp → Silver Heels Mine; 1983-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kendall Mining International Inc → Silver Heels Mine; 1983-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kendall Mining International Inc → Kendall Mining Corp; 1983-06-14 to current/open; source msha-controller-operator-history