# Relationship history for MSHA mine 1502270

Current hierarchy: **Swartwood T Marshall → Red Rock Coal Company Inc → No 1 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Upper Mason Coal Company → No 1 Mine; 1971-02-01 to 1975-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → No 1 Mine; 1971-02-01 to 1975-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Upper Mason Coal Company; 1971-02-01 to 1975-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Coal Fuels Inc → No 1 Mine; 1975-06-02 to 1977-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Swartwood T Marshall → No 1 Mine; 1975-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swartwood T Marshall → Coal Fuels Inc; 1975-06-02 to 1977-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Red Rock Coal Company Inc → No 1 Mine; 1977-10-04 to 1978-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Saylor Lonnie → No 1 Mine; 1977-10-04 to 1978-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Saylor Lonnie → Red Rock Coal Company Inc; 1977-10-04 to 1978-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Red Rock Coal Company Inc → No 1 Mine; 1978-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Swartwood T Marshall → No 1 Mine; 1978-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swartwood T Marshall → Red Rock Coal Company Inc; 1978-10-12 to current/open; source msha-controller-operator-history