bullet proof glass was implemented in the oval office. (17 dez 1941 ano – 31 maio 2017 ano)
Descrição:
 after the bombing of pearl harbor, one of several security measures taken to protect the president was installing bulletproof glass in the oval office. 
Adicionado na linha do tempo:
Data:
17 dez 1941 ano
31 maio 2017 ano
 ~ 75 years