# Relationship history for MSHA mine 1510956

Current hierarchy: **Jamestown Resources Inc → Blackey Elkhorn Coal Corp → Frog Pond 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:** Regent Energy Corp → Frog Pond Tipple; 1977-11-01 to 1978-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Hart Homer O → Frog Pond Tipple; 1977-11-01 to 1978-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Hart Homer O → Regent Energy Corp; 1977-11-01 to 1978-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Blackey Elkhorn Coal Corp → Frog Pond Tipple; 1978-11-13 to 1981-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Mc Gowan Frank B & Leroy Lackey Jr → Frog Pond Tipple; 1978-11-13 to 1981-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Mc Gowan Frank B & Leroy Lackey Jr → Blackey Elkhorn Coal Corp; 1978-11-13 to 1981-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Blackey Elkhorn Coal Corp → Frog Pond Tipple; 1981-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jamestown Resources Inc → Frog Pond Tipple; 1981-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamestown Resources Inc → Blackey Elkhorn Coal Corp; 1981-11-09 to current/open; source msha-controller-operator-history