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In September, when it was still hot, Roland arrived. When Roland and Eric saw the stove, Roland said,

"I'm tired of ...... being surprised."

"If Jin-san told me he was the chief kingdom magician in King's Landing, I'd believe it.

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They bought the stove manufacturing method from Jin and also agreed to purchase the magic stone from him. Now the village of Kaina had another means of obtaining foreign currency after flour.

"And now..."

When Hitoshi started to say something more, he looked at me tiredly as if he still had something to say,

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I was wondering if you could show me your carriage or cart, Mr. Roland.

Roland looked at me suspiciously.

"A cart?　And why?"

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It was a natural question.

"I was wondering if it would be possible to move the cart more lightly.

Jin said what he was thinking,

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Roland says, "If you reduce the weight, of course it will be lighter, but then you will be able to carry less goods and make less profit.

Roland says. But that is not what Jin meant.

"No, no, that's not what I mean," Roland explains, "I mean that we have to modify the wheels so that they turn more lightly.

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But neither of them seemed to understand what he meant, so Jin took them to Martha's house to prove his point.

"Huh?　What's going on with you, Onii-chan and Uncle Oji-chan?"

Martha was not home, but Hannah was, so Jin thought it was a good idea,

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"Yes, I just wanted to show you Hannah's caravan," he told her.

He said to Hannah, "Yes, I thought I'd show you Hannah's car.

"My cart?　Yes, that's fine. I'll bring it right back!

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With that Hannah went to the barn and came back with the cart in tow. Pulling it with one hand and running. Roland and Eric were surprised to see her.

"What an amazing view. ......"

"Oh, he's so powerful for such a little guy."

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Both men's faces scrunch up a bit, but Jin laughs,

"Well, why don't you try pulling it yourself?"

I let Hannah pull the cart.

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"What is it, this lightness?　What is this lightness?

She seemed to notice the difference immediately. I explained the bearings and their effects. And if you show them a wheel spinning in the air and see that it keeps spinning for a long time...,

I finally understood what ...... Jin meant. So, you would be willing to equip our carts with this as well?"

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"Yes. Yes.

"Yes, we would like that very much.

So we had the cart brought in and the wheels, axles, and bearings were replaced. He also added rubber tires.

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"Um, Mr. Jin, what is that attached to this wheel?

"Oh, they are rubber tires.

"Rubber tires?

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"Well, try it out."

Roland and Eric are placed on an empty cart, and Jin shows them how it works. The effect of the ball bearings was amazing, and even Jin, who was not very strong, was able to pull the cart with ease. The rubber tires also improve the comfort of the ride.

Hannah, who was watching the demonstration, looked pleased and said, "Let me try it, too!

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Hannah, who was watching, said happily, so I took her place,

"I'm strong!" she said.

She was happily pulling the cart with the two of them on it.

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"Ah, ah, ah, ah, ah, ah, ah ......"

Roland and Eric are in full retreat. Well, that's the effect of the bearings.

After such a scene, they finally understood that the bearings made the car lighter and the rubber tires improved the ride quality.

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"Well, Mr. Jin, this modification is amazing. Are you sure you don't need the money?"

"Yes, but in exchange, we would like you to come to our village more often.

Hearing this, Roland turned into a merchant,

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"I see, so you are making an up-front investment for that purpose.

Roland understood Jin's intention correctly.

"Yes, well," he said.

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"Yes, well," he said, "but the performance is satisfactory, and if the stove sells well, we will need to purchase the magic stone. Okay, it may not be possible to suddenly increase to once a month, but I will make an effort to come twice every three months.

Jin was relieved to hear that he had achieved his initial goal. But this time, Roland asked,

"By the way, Mr. Jin, that round thing over there that the children are playing with, is that ...... too?

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Jin looked in the direction to which Roland pointed. There were children throwing dodgeballs at each other.

Yes, that's right. It's called a ball, and it's made of the same material as a tire.

"Well, can't you sell this to us, too?

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"Ah, ah, that's fine."

We were looking for a use for the tea trees in the forest, since we found that they yielded quite a lot of resin.

That's why we decided to sell rubber balls. Since it is too difficult to explain the manufacturing process, we only show the rubber ball as a product this time. At first, we sold 50 each of baseballs, clues, and dodge balls.

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After all the negotiations were over, Eric started to get nervous. Jin somehow guessed the reason,

"It's cooler if we go to the Erme River, let's go together.

Let's go to the Ermee River together. Unable to refuse, Eric and Jin headed for the river, but when they arrived at the river, his face was colored with joy.

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When they arrived at the river, his face lit up with joy, because there was Barbara in a bathing suit with a float in the river.

"Jin-san, what is that thing she is holding on to?

"Oh, that's a floatation ring. Even if you can't swim, you can stay afloat if you wear it.

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Barbara, who had overheard their conversation, spotted Eric and waved to him. Eric looked like he wanted to get in the water right away, but he did not have a bathing suit. Then Jin said,

"Eric, if you want to swim, there is a hut over there.

He then pulls out a new bathing suit that he had secretly brought and hands it to Jin. I had prepared this for him.

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"Oh, thank you!"

Eric snatched it up and dashed to the changing hut.

Eric and Barbara swam until the sun went down. It is a side story that Eric was chastised for not helping to organize the merchandise and Barbara was chastised for playing around without taking care of the housework.

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It was one of those days when summer was almost over.