# Relationship history for MSHA mine 4603757

Current hierarchy: **Midland Resources Inc → Bemis Holding Company → Point Mountain No 3 Tipple**

- 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:** Bemis Holding Company Inc → Point Mountain No 3 Tipple; 1950-01-01 to 1978-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Turner J Preston → Point Mountain No 3 Tipple; 1950-01-01 to 1978-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Turner J Preston → Bemis Holding Company Inc; 1950-01-01 to 1978-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Bemis Holding Company → Point Mountain No 3 Tipple; 1978-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Midland Resources Inc → Point Mountain No 3 Tipple; 1978-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Midland Resources Inc → Bemis Holding Company; 1978-04-18 to current/open; source msha-controller-operator-history