Spirometer

The ornamental design for a spirometer, as shown and described.

FIG. 1 is a side elevational view of a spirometer, showing my new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a bottom perspective view thereof; and,

FIG. 4 is a bottom plan view thereof, the top view being identical thereto.

Patent	Priority	Assignee	Title
D833014,	Jan 25 2017	HEALTHUP SP. Z.O.O.	Portable spirometer

Patent	Priority	Assignee	Title
2837083,
4221381,	Dec 26 1978	Albany International Corp.	Respiratory exerciser
4232683,	Jul 17 1978	CREDITANSTALT CORPORATE FINANCE, INC	Therapeutic incentive spirometer
4441505,	Jan 11 1982	Kinetics Measurement Corp.	Sensing device for human lung exhalation/inhalation air flow measurement

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