What is a heifer cow? A heifer is a mature female cow that has not calved, or given birth to a calf, yet. As soon as a heifer gives birth, she becomes a cow. A cow refers to a female of any age that has given birth.
When most people think about gas masks or respirators, what they usually envision is a tight-fitting plastic or rubber face mask with some sort of filter cartridge. The mask covers the nose and mouth. These are called half-mask air-purifying respirators.
22.90 28.00. The Czech M10M gas mask with filter and drinking tube is lightweight, and specially designed for extended use with superior comfort, secure fit, and low breathing resistance. The Czech M10M gas mask intends to offer protection against nuclear, chemical, and biological agents.