Types Of
| Type | Remarks |
| Simple type (Type A) | with mask, no mouthpiece |
| Simple type (B type) | with mouthpiece, without face mask |
| Adjustable type (C type) | with mask and mouthpiece |
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| Type | Remarks |
| Simple type (Type A) | with mask, no mouthpiece |
| Simple type (B type) | with mouthpiece, without face mask |
| Adjustable type (C type) | with mask and mouthpiece |
