# Relationship history for MSHA mine 0900534

Current hierarchy: **Gregory James D → Gregory Company Inc → Chattooga No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Coalman Inc → Chattooga No 1 Strip; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Coalman Inc → Chattooga No 1 Strip; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Coalman Inc → Coalman Inc; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Pettyjohn Charles S → Chattooga No 1 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Energy Resources Corp → Chattooga No 1 Strip; 1974-07-01 to 1975-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Pettyjohn Charles S → Vulcan Energy Resources Corp; 1974-07-01 to 1975-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Gregisco → Chattooga No 1 Strip; 1975-12-01 to 1976-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Gregisco → Chattooga No 1 Strip; 1975-12-01 to 1976-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Gregisco → Gregisco; 1975-12-01 to 1976-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Lookout Mountain Coal Co → Chattooga No 1 Strip; 1976-04-01 to 1978-11-26; source msha-controller-operator-history
- **controller_controls_mine:** Gregory Company Inc & Cari Int'L Mining Corp → Chattooga No 1 Strip; 1976-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory Company Inc & Cari Int'L Mining Corp → Lookout Mountain Coal Co; 1976-04-01 to 1978-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Gregory Company Inc → Chattooga No 1 Strip; 1978-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregory James D → Chattooga No 1 Strip; 1978-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory James D → Gregory Company Inc; 1978-11-27 to current/open; source msha-controller-operator-history