Your search query on "MCDONNELL & MILLER Limit & Snap Action Switches" returned the following results:

MCDONNELL & MILLER 115000 FS4-3T3-3/4 FLOW SWITCH 3/4" NPT, LOW FLOW RATE, SPDT (195353353500)

McDonnell & Miller FS4-3S Flow Switch 1" NPT 115VAC@7.4A.F.L. 160 psi USED (225289772588)

Mcdonnell & miller afe-1 air flow switch (334377267615)

51-S-2 Mcdonnell Miller 51-S W/#2 Cutoff Sw.,#135900 OEM 51-S-2 (383829551027)