参考文献:
The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland Defence Evaluation Research Agency Patent: US63374 B1, Location in patent: Page column 1
参考文献:
The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britian and Northern Ireland of Defence Evaluation and Research Agency Patent: US64636 B1, 1