The topic became episode called "four dimensional cantilever" broadcast on May 12, 2017. Many of the tools that Doraemon comes out of the 4 - dimensional pocket are "many times of one - off disposable".
Furthermore, many fans are amazed at the following "Reason for being disposable"!
Some fans say "I knew", others said "Early ears"
Reason why the secret tool is disposable. Doraemon continues to speak the words here.
"That's because it costs less cheaply"
Quoted from Doraemon
