Milestones in respiratory protection.

The graphic lists major historical milestones in the development of respiratory equipment.

Bibliographic Details
Format:	Government Document Photo
Language:	English
Published:	[Washington, D.C.] : Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2019.
Subjects:	Breathing apparatus > History. Instructional and educational works.
Online Access:	Available in PDF and JPG versions

Description
Summary:	The graphic lists major historical milestones in the development of respiratory equipment.
Item Description:	"September 2019."
Physical Description:	1 online resource (1 image) : black and white