# Relationship history for MSHA mine 1510627

Current hierarchy: **Martin Lohren → Joshco Mining Corp → Squire Ridge**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Joshco Mining Corp → Squire Ridge; 1977-08-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Sauls Grady C → Squire Ridge; 1977-08-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Sauls Grady C → Joshco Mining Corp; 1977-08-01 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Joshco Mining Corp → Squire Ridge; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Lohren → Squire Ridge; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Lohren → Joshco Mining Corp; 1979-11-01 to current/open; source msha-controller-operator-history