# Relationship history for MSHA mine 0101497

Current hierarchy: **Hill Bryson → Tele Corp Inc → Acmar Strip**

- 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

- **controller_controls_mine:** Hill Bryson → Acmar Strip; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Wayne Cast Iron Pipt Company → Acmar Strip; 1976-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Berry Coal Company Inc → Acmar Strip; 1976-03-01 to 1977-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Mc Wayne Cast Iron Pipt Company → Berry Coal Company Inc; 1976-03-01 to 1977-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Tele Corp Inc → Acmar Strip; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hill Bryson → Tele Corp Inc; 1977-10-01 to current/open; source msha-controller-operator-history