JPH0348357Y2 - - Google Patents

Info

Publication number

JPH0348357Y2

JPH0348357Y2 JP17705585U JP17705585U JPH0348357Y2 JP H0348357 Y2 JPH0348357 Y2 JP H0348357Y2 JP 17705585 U JP17705585 U JP 17705585U JP 17705585 U JP17705585 U JP 17705585U JP H0348357 Y2 JPH0348357 Y2 JP H0348357Y2

Authority

JP

Japan

Prior art keywords

ventilation

ventilation hole

cover

ridge

gap

Prior art date

1985-11-18

Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Links

• Espacenet
• Global Dossier
• Discuss

• 238000009423 ventilation Methods 0.000 claims description 86
• 238000005192 partition Methods 0.000 claims description 7
• 239000000463 material Substances 0.000 description 4
• 238000000034 method Methods 0.000 description 4
• 238000010586 diagram Methods 0.000 description 2
• 230000000694 effects Effects 0.000 description 2
• 238000005516 engineering process Methods 0.000 description 2
• 238000005553 drilling Methods 0.000 description 1
• 230000000630 rising effect Effects 0.000 description 1
• 238000010079 rubber tapping Methods 0.000 description 1
• 239000004577 thatch Substances 0.000 description 1