| http://www.w3.org/ns/prov#value | - In addition, as shown in FIG. 6, a concave portion 57 b is formed in a lower surface of the connecting portion 57 for receiving therein a spring bracket 13 of the intake valve 10 which opens and closes the intake port opening 4 1a and furthermore, lightening portions 57 c are formed in the lower surface except for a portion thereof which is situated in the vicinity of the concave portion 57 b, whe
|
