said push buttons including respective carriages fixed thereon for sliding movement therewith and having respective soft resilient compressible rubber like valve members fixedly mounted on {HEAD ~ the respective carriages} for sliding {TAIL ~ movement} therewith and facing transversely relative to the predetermined direction of sliding movement, 
for sliding
said push buttons including respective carriages fixed thereon for sliding movement therewith and having respective soft resilient compressible rubber like valve members fixedly mounted on { HEAD ~ the respective carriages } for sliding { TAIL ~ movement } therewith and facing transversely relative to the predetermined direction of sliding movement ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH